If the Son had a beginning then God had no power before him

And although the breath of all this mighty and immeasurable power, and the vigor itself produced, so to speak, by its own existence, proceed from the power itself, as the will does from the mind, yet even this will of God is nevertheless made to become the power of God.

…And if he shall grant that there was once a beginning, when that breath proceeded from the power of God, we shall ask him again, why not even before the beginning, which he has allowed; and in this way, ever demanding an earlier date, and going upwards with our interrogations, we shall arrive at this conclusion, that as God was always possessed of power and will, there never was any reason of propriety or otherwise, why He may not have always possessed that blessing which He desired.  By which it is shown that that breath of God’s power always existed, having no beginning save God Himself.

Origen
On First Principles
Chapter II

Looking upon the Son’s image allows us to see God because He is God

In order, however, to arrive at a fuller understanding of the manner in which the Saviour is the figure of the person or subsistence of God, let us take an instance, which, although it does not describe the subject of which we are treating either fully or appropriately, may nevertheless be seen to be employed for this purpose only, to show that the Son of God, who was in the form of God, divesting Himself (of His glory), makes it His object, by this very divesting of Himself, to demonstrate to us the fulness of His deity.  For instance, suppose that there were a statue of so enormous a size as to fill the whole world, and which on that account could be seen by no one; and that another statue were formed altogether resembling it in the shape of the limbs, and in the features of the countenance, and in form and material, but without the same immensity of size, so that those who were unable to behold the one of enormous proportions, should, on seeing the latter, acknowledge that they had seen the former, because it preserved all the features of its limbs and countenance, and even the very form and material, so closely, as to be altogether undistinguishable from it; by some such similitude, the Son of God, divesting Himself of His equality with the Father, and showing to us the way to the knowledge of Him, is made the express image of His person:  so that we, who were unable to look upon the glory of that marvelous light when placed in the greatness of His Godhead, may, by His being made to us brightness, obtain the means of beholding the divine light by looking upon the brightness.

Origen
On First Principles, Book I
Chapter II

The Son is light from light and can’t be separated from God

According to John, “God is light.”  The only-begotten Son, therefore, is the glory of this light, proceeding inseparably from (God) Himself, as brightness does from light, and illuminating the whole of creation.

Origen
On First Principles, Book I
Chapter II

The Son is the image of the invisible God begotten before all time

…the image of the Son of God, of whom we are now speaking, may be compared to the second of the above examples, even in respect of this, that He is the invisible image of the invisible God, in the same manner as we say, according to the sacred history, that the image of Adam is his son Seth.  The words are, “And Adam begat Seth in his own likeness, and after his own image.”  Now this image contains the unity of nature and substance belonging to Father and Son.  For if the Son do, in like manner, all those things which the Father doth, then, in virtue of the Son doing all things like the Father, is the image of the Father formed in the Son, who is born of Him, like an act of His will proceeding from the mind.  And I am therefore of opinion that the will of the Father ought alone to be sufficient for the existence of that which He wishes to exist.  For in the exercise of His will He employs no other way than that which is made known by the counsel of His will.  And thus also the existence of the Son is generated by Him.  For this point must above all others be maintained by those who allow nothing to be unbegotten, i.e., unborn, save God the Father only.  And we must be careful not to fall into the absurdities of those who picture to themselves certain emanations, so as to divide the divine nature into parts, and who divide God the Father as far as they can, since even to entertain the remotest suspicion of such a thing regarding an incorporeal being is not only the height of impiety, but a mark of the greatest folly, it being most remote from any intelligent conception that there should be any physical division of any incorporeal nature.  Rather, therefore, as an act of the will proceeds from the understanding, and neither cuts off any part nor is separated or divided from it, so after some such fashion is the Father to be supposed as having begotten the Son, His own image; namely, so that, as He is Himself invisible by nature, He also begat an image that was invisible.  For the Son is the Word, and therefore we are not to understand that anything in Him is cognisable by the senses.  He is wisdom, and in wisdom there can be no suspicion of anything corporeal.  He is the true light, which enlightens every man that cometh into this world; but He has nothing in common with the light of this sun.  Our Saviour, therefore, is the image of the invisible God, inasmuch as compared with the Father Himself He is the truth:  and as compared with us, to whom He reveals the Father, He is the image by which we come to the knowledge of the Father, whom no one knows save the Son, and he to whom the Son is pleased to reveal Him.  And the method of revealing Him is through the understanding.  For He by whom the Son Himself is understood, understands, as a consequence, the Father also, according to His own words:  “He that hath seen Me, hath seen the Father also.”

Origen
On First Principles, Book I
Chapter II

Jesus’ sonship is eternal before His incarnation

But it is monstrous and unlawful to compare God the Father, in the generation of His only-begotten Son, and in the substance of the same, to any man or other living thing engaged in such an act; for we must of necessity hold that there is something exceptional and worthy of God which does not admit of any comparison at all, not merely in things, but which cannot even be conceived by thought or discovered by perception, so that a human mind should be able to apprehend how the unbegotten God is made the Father of the only-begotten Son.  Because His generation is as eternal and everlasting as the brilliancy which is produced from the sun.  For it is not by receiving the breath of life that He is made a Son, by any outward act, but by His own nature.

Origen
On First Principles, Book I
Chapter II

The Logos is begotten of the Father in eternity and never had a beginning

In the first place, we must note that the nature of that deity which is in Christ in respect of His being the only-begotten Son of God is one thing, and that human nature which He assumed in these last times for the purposes of the dispensation (of grace) is another.  And therefore we have first to ascertain what the only-begotten Son of God is, seeing He is called by many different names, according to the circumstances and views of individuals.  For He is termed Wisdom, according to the expression of Solomon:  “The Lord created me—the beginning of His ways, and among His works, before He made any other thing; He founded me before the ages.  In the beginning, before He formed the earth, before He brought forth the fountains of waters, before the mountains were made strong, before all the hills, He brought me forth.”  He is also styled First-born, as the apostle has declared:  “who is the first-born of every creature.”  The first-born, however, is not by nature a different person from the Wisdom, but one and the same.  Finally, the Apostle Paul says that “Christ (is) the power of God and the wisdom of God.”

Let no one, however, imagine that we mean anything impersonal when we call Him the wisdom of God; or suppose, for example, that we understand Him to be, not a living being endowed with wisdom, but something which makes men wise, giving itself to, and implanting itself in, the minds of those who are made capable of receiving His virtues and intelligence.

…And who that is capable of entertaining reverential thoughts or feelings regarding God, can suppose or believe that God the Father ever existed, even for a moment of time, without having generated this Wisdom?  For in that case he must say either that God was unable to generate Wisdom before He produced her, so that He afterwards called into being her who formerly did not exist, or that He possessed the power indeed, but—what cannot be said of God without impiety—was unwilling to use it; both of which suppositions, it is patent to all, are alike absurd and impious:  for they amount to this, either that God advanced from a condition of inability to one of ability, or that, although possessed of the power, He concealed it, and delayed the generation of Wisdom.  Wherefore we have always held that God is the Father of His only-begotten Son, who was born indeed of Him, and derives from Him what He is, but without any beginning, not only such as may be measured by any divisions of time, but even that which the mind alone can contemplate within itself, or behold, so to speak, with the naked powers of the understanding.  And therefore we must believe that Wisdom was generated before any beginning that can be either comprehended or expressed.

Origen
On First Principles, Book I
Chapter II

The nature of deity belongs equally to the Father and the Son

…if, He were a being who was visible by nature, and merely escaped or baffled the view of a frailer creature, but because by the nature of His being it is impossible for Him to be seen.  And if you should ask of me what is my opinion regarding the Only-begotten Himself, whether the nature of God, which is naturally invisible, be not visible even to Him, let not such a question appear to you at once to be either absurd or impious, because we shall give you a logical reason.  It is one thing to see, and another to know:  to see and to be seen is a property of bodies; to know and to be known, an attribute of intellectual being.  Whatever, therefore, is a property of bodies, cannot be predicated either of the Father or of the Son; but what belongs to the nature of deity is common to the Father and the Son. Finally, even He Himself, in the Gospel, did not say that no one has seen the Father, save the Son, nor any one the Son, save the Father; but His words are:  “No one knoweth the Son, save the Father; nor any one the Father, save the Son.” By which it is clearly shown, that whatever among bodily natures is called seeing and being seen, is termed, between the Father and the Son, a knowing and being known, by means of the power of knowledge, not by the frailness of the sense of sight.  Because, then, neither seeing nor being seen can be properly applied to an incorporeal and invisible nature, neither is the Father, in the Gospel, said to be seen by the Son, nor the Son by the Father, but the one is said to be known by the other.

Origen
On First Principles, Book I
Chapter I

God has no body

As, therefore, our understanding is unable of itself to behold God Himself as He is, it knows the Father of the world from the beauty of His works and the comeliness of His creatures.  God, therefore, is not to be thought of as being either a body or as existing in a body, but as an uncompounded intellectual nature, admitting within Himself no addition of any kind; so that He cannot be believed to have within him a greater and a less, but is such that He is in all parts Μονάς, and, so to speak, ῾Ενάς, and is the mind and source from which all intellectual nature or mind takes its beginning.

Origen
On First Principles, Book I
Chapter I

The Saints participate in the life of the Holy Spirit who is formless

And since many saints participate in the Holy Spirit, He cannot therefore be understood to be a body, which being divided into corporeal parts, is partaken of by each one of the saints; but He is manifestly a sanctifying power, in which all are said to have a share who have deserved to be sanctified by His grace.

Origen
On First Principles, Book I
Chapter I

The Lord is the Word and the Spirit of God

But if we turn to the Lord, where also is the word of God, and where the Holy Spirit reveals spiritual knowledge, then the veil is taken away, and with unveiled face we shall behold the glory of the Lord in the holy Scriptures.

Origen
On First Principles, Book I
Chapter I