The phrase "great affirmation" means a strong and positive statement or confirmation. It is an expression that boosts confidence and reinforces one's beliefs or ideas. Full definition
At the risk of some repetition, let us look from this angle at certain great affirmations of our faith that were suggested from a more general standpoint in the first chapter. (religion-online.org)
Although we have Peter's great affirmation at Caesarea Philippi, «Thou art the Christ, the Son of the living God,» (Matt. (religion-online.org)
I found deep wisdom (and errors) in all of the Great Religious Traditions; but nowhere did I find as great an affirmation of the human person as the Judeo - Christian Tradition and especially in Christian mystery of the Incarnation. (nakedpastor.com)