Apostolic Constitutions, Book V 5

1Every one therefore who learns any art, when he sees his master by his diligence and skill perfecting his art, does himself earnestly endeavour to make what he takes in hand like to it. If he is not able, he is not perfected in his work. We therefore who have a Master, our Lord Jesus Christ, why do we not follow His doctrine? — since He renounced repose, pleasure, glory, riches, pride, the power of revenge, His mother and brethren, nay, and moreover His own life, on account of His piety towards His Father, and His love to us the race of mankind; and suffered not only persecution and stripes, reproach and mockery, but also crucifixion, that He might save the penitent, both Jews and Gentiles. If therefore He for our sakes renounced His repose, was not ashamed of the cross, and did not esteem death inglorious, why do not we imitate His sufferings, and renounce on His account even our own life, with that patience which He gives us? For He did all for our sakes, but we do it for our own sakes: for He does not stand in need of us, but we stand in need of His mercy. He only requires the sincerity and readiness of our faith, as the Scripture says: If you are righteous, what do you give to Him? Or what will He receive at your hand? Your wickedness is to a man like yourself, and your righteousness to a son of man.