For where the church is, there is the Spirit of God, and where the Spirit of God, there is the church and all grace.

Prior to Valentinus, those who follow Valentinus had no existence. Nor did those from Marcion exist before Marcion. Nor, in short, did any of those malignant-minded people, whom I have listed above, have any existence previous to the initiators and inventors of their perversity.

The glory of God is a human being fully alive; and to be alive consists in beholding God.

For I have shown from the Scriptures, that no one of the sons of Adam is as to everything, and absolutely, called God, or named Lord. But that He is Himself in His own right, beyond all men who ever lived, God, and Lord, and King Eternal, and the Incarnate Word, proclaimed by all the prophets, the apostles, and by the Spirit Himself, may be seen by all who have attained to even a small portion of the truth. Now the Scriptures would not have testified these things of Him, if, like others, He had been a mere man.

The business of the Christian is nothing else but to be ever preparing for death.

When we stand in the light it is not we who illumine the light and cause it to shine but we are illuminated and made shining by the light... God grants his blessings on those who serve him because they are serving him and on those who follow him because they are following him, but he receives no blessing from them because he is perfect and without need

Suppose there arise a dispute relative to some important question among us, should we not have recourse to the most ancient Churches with which the apostles held constant intercourse, and learn from them what is certain and clear in regard to the present question? For how should it be if the apostles themselves had not left us writings? Would it not be necessary, in that case, to follow the course of the tradition which they handed down to those to whom they did commit the Churches?