There is no Church without Holy Orders

In like manner, let all reverence the deacons as an appointment of Jesus Christ, and the bishop as Jesus Christ, who is the Son of the Father, and the presbyters as the sanhedrim of God, and assembly of the apostles. Apart from these, there is no Church.

Ignatius of Antioch
Epistle to the Trallians
Chapter III

The Trinity, the Orders, and the Flesh and Spirit

Study, therefore, to be established in the doctrines of the Lord and the apostles, that so all things, whatsoever ye do, may prosper both in the flesh and spirit; in faith and love; in the Son, and in the Father, and in the Spirit; in the beginning and in the end; with your most admirable bishop, and the well-compacted spiritual crown of your presbytery, and the deacons who are according to God. Be ye subject to the bishop, and to one another, as Jesus Christ to the Father, according to the flesh, and the apostles to Christ, and to the Father, and to the Spirit; that so there may be a union both fleshly and spiritual.

Ignatius of Antioch
Epistle to the Magnesians
Chapter XIII

The Sunday Eucharist replaces the Sabbath

If, therefore, those who were brought up in the ancient order of things have come to the possession of a new hope, no longer observing the Sabbath, but living in the observance of the Lord’s Day, on which also our life has sprung up again by Him and by His death—whom some deny, by which mystery we have obtained faith, and therefore endure, that we may be found the disciples of Jesus Christ, our only Master—how shall we be able to live apart from Him, whose disciples the prophets themselves in the Spirit did wait for Him as their Teacher? And therefore He whom they rightly waited for, being come, raised them from the dead.

Ignatius of Antioch
Epistle to the Magnesians
Chapter IX

Jesus — God manifested

Be not deceived with strange doctrines, nor with old fables, which are unprofitable. For if we still live according to the Jewish law, we acknowledge that we have not received grace. For the divinest prophets lived according to Christ Jesus. On this account also they were persecuted, being inspired by His grace to fully convince the unbelieving that there is one God, who has manifested Himself by Jesus Christ His Son, who is His eternal Word, not proceeding forth from silence, and who in all things pleased Him that sent Him.

Ignatius of Antioch
Epistle to the Magnesians
Chapter VIII

Do all things in harmony with the Holy Orders

Since therefore I have, in the persons before mentioned, beheld the whole multitude of you in faith and love, I exhort you to study to do all things with a divine harmony, while your bishop presides in the place of God, and your presbyters in the place of the assembly of the apostles, along with your deacons, who are most dear to me, and are entrusted with the ministry of Jesus Christ, who was with the Father before the beginning of time, and in the end was revealed.

Ignatius of Antioch
Epistle to the Magnesians
Chapter VI

The Father is the bishop of us all

Now it becomes you also not to treat your bishop too familiarly on account of his youth, but to yield him all reverence, having respect to the power of God the Father, as I have known even holy presbyters do, not judging rashly, from the manifest youthful appearance of their bishop, but as being themselves prudent in God, submitting to him, or rather not to him, but to the Father of Jesus Christ, the bishop of us all.

Ignatius of Antioch
Epistle to the Magnesians
Chapter III

Jesus — the constant source of our life

For as one who has been thought worthy of the most honorable of all names, in those bonds which I bear about, I commend the Churches, in which I pray for a union both of the flesh and spirit of Jesus Christ, the constant source of our life, and of faith and love, to which nothing is to be preferred, but especially of Jesus and the Father, in whom, if we endure all the assaults of the prince of this world, and escape them, we shall enjoy God.

Ignatius of Antioch
Epistle to the Magnesians
Chapter I