“The Christianity of the first centuries recognized as productions of good art, only legends, lives of saints, sermons, prayers, and hymn-singing evoking love of Christ, emotion at his life, desire to follow his example, renunciation of worldly life, humility, and the love of others; all productions transmitting feelings of personal enjoyment they considered to be bad, and therefore rejected … This was so among the Christians of the first centuries who accepted Christ teachings, if not quite in its true form, at least not yet in the perverted, paganized form in which it was accepted subsequently.
But besides this Christianity, from the time of the wholesale conversion of whole nations by order of the authorities, as in the days of Constantine, Charlemagne and Vladimir, there appeared another, a Church Christianity, which was nearer to paganism than to Christ's teaching. And this Church Christianity … did not acknowledge the fundamental and essential positions of true Christianity — the direct relationship of each individual to the Father, the consequent brotherhood and equality of all people, and the substitution of humility and love in place of every kind of violence — but, on the contrary, having founded a heavenly hierarchy similar to the pagan mythology, and having introduced the worship of Christ, of the Virgin, of angels, of apostles, of saints, and of martyrs, but not only of these divinities themselves but of their images, it made blind faith in its ordinances an essential point of its teachings.
However foreign this teaching may have been to true Christianity, however degraded, not only in comparison with true Christianity, but even with the life-conception of the Romans such as Julian and others, it was for all that, to the barbarians who accepted it, a higher doctrine than their former adoration of gods, heroes, and good and bad spirits. And therefore this teaching was a religion to them, and on the basis of that religion the art of the time was assessed. And art transmitting pious adoration of the Virgin, Jesus, the saints, and the angels, a blind faith in and submission to the Church, fear of torments and hope of blessedness in a life beyond the grave, was considered good; all art opposed to this was considered bad.”

What is Art? (1897)