To Believe in Him without Doing His Will is Not to Believe in Him at All

To believe in Him and not to believe in what He believed, not to love what He loved and not to desire what He desired, is not to believe in Him. To separate Him from the “content” of His life, to expect miracles and help from Him without doing what He did, and finally to call Him “Lord” and worship Him without fulfilling the will of His Father, is not to believe in Him. We are saved not because we believe in His “supernatural” power—such faith He does not want from us—but because we accept with our whole being and make ours the desire that fills His life, which is His life and ultimately makes Him descend into death and abolish it.

Alexander Schmemann
Of Water and Spirit
pg. 65

Iconoclasm requires one to follow the whole law, and therefore fall from grace

If you give up images on account of the law, you should also keep the Sabbath and be circumcised, for these are severely inculcated by it…But you must know that if you observe the law, Christ will profit you nothing.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

Those who are against images should keep the whole law

Now, consider the handiwork of man becoming the likeness of the cherubim. How, then, can you make the law a pretence for giving up what it orders? If you invoke it against images, you should keep the Sabbath, and practise circumcision. It is certain that “if you observe the law, Christ will not profit you. You who are justified in the law, you are fallen from grace.”

St. John Damascene
Apology Against Those Who Decry Holy Images
Part I

The soul is judged according to its works

After these points, also, the apostolic teaching is that the soul, having a substance and life of its own, shall, after its departure from the world, be rewarded according to its deserts, being destined to obtain either an inheritance of eternal life and blessedness, if its actions shall have procured this for it, or to be delivered up to eternal fire and punishments, if the guilt of its crimes shall have brought it down to this:  and also, that there is to be a time of resurrection from the dead, when this body, which now “is sown in corruption, shall rise in incorruption,” and that which “is sown in dishonour will rise in glory.”  This also is clearly defined in the teaching of the Church, that every rational soul is possessed of free-will and volition; that it has a struggle to maintain with the devil and his angels, and opposing influences, because they strive to burden it with sins; but if we live rightly and wisely, we should endeavour to shake ourselves free of a burden of that kind.

Origen
On First Principles, Book I
Preface

Grace and truth were obtained through Christ

All who believe and are assured that grace and truth were obtained through Jesus Christ, and who know Christ to be the truth, agreeably to His own declaration, “I am the truth,” derive the knowledge which incites men to a good and happy life from no other source than from the very words and teaching of Christ.

Origen
On First Principles, Book I
Preface

God-Christ will judge according to works and then the millenium begins

Ye who are to be inhabitants of the heavens with God-Christ, hold fast the beginning, look at all things from heaven.  Let simplicity, let meekness dwell in your body.  Be not angry with thy devout brother without a cause, for ye shall receive whatever ye may have done from him.  This has pleased Christ, that the dead should rise again, yea, with their bodies; and those, too, whom in this world the fire has burned, when six thousand years are completed, and the world has come to an end.  The heaven in the meantime is changed with an altered course, for then the wicked are burnt up with divine fire.  The creature with groaning burns with the anger of the highest God.  Those who are more worthy, and who are begotten of an illustrious stem, and the men of nobility under the conquered Antichrist, according to God’s command living again in the world for a thousand years, indeed, that they may serve the saints, and the High One, under a servile yoke, that they may bear victuals on their neck.  Moreover, that they may be judged again when the reign is finished.  They who make God of no account when the thousandth year is finished shall perish by fire, when they themselves shall speak to the mountains.  All flesh in the monuments and tombs is restored according to its deed:  they are plunged in hell; they bear their punishments in the world; they are shown to them, and they read the things transacted from heaven; the reward according to one’s deeds in a perpetual tyranny.

Commodianus
Instructions of Commodianus
Chapter LXXX

True Christians are known and judged according to their works

Of the seed of the tares, who stand mingled in the Church.  When the times of the harvest are filled up, the tares that have sprung up are separated from the fruit, because God had not sent them.  The husbandman separates all those collected tares.  The law is our field; whoever does good in it, assuredly the Ruler Himself will afford a true repose, for the tares are burned with fire.  If, therefore, you think that under one they are delaying, you are wrong.  I designate you as barren Christians; cursed was the fig-tree without fruit in the word of the Lord, and immediately it withered away.  Ye do not works; ye prepare no gift for the treasury, and yet ye thus vainly think to deserve well of the Lord.

Commodianus
Instructions of Commodianus
Chapter LV

Faith in Christ overcomes the “second death” after the resurrection

Now astounded, swear that thou wilt believe in Christ; for the Old Testament proclaims concerning Him.  For it is needful only to believe in Him who was dead, to be able to rise again to live for all time.  Therefore, if thou art one who disbelievest that these things shall be, at length he shall be overcome in his guilt in the second death.  I will declare things to come in few words in this little treatise.  In it can be known when hope must be preferred.  Still I exhort you as quickly as possible to believe in Christ.

Commodianus
Instructions of Commodianus
Chapter XXV