Here is St. Augustine's description of his moment of conversion:

"I was weeping in the most bitter contrition of my heart, when I heard the voice of children from a neighboring house chanting, "take up and read; take up and read." I could not remember ever having heard the like, so checking the torrent of my tears, I arose, interpreting it to be no other than a command from God to open the book and read the first chapter I should find. Eagerly then I returned to the place where I had laid the volume of the apostle. I seized, opened, and in silence read that section on which my eyes first fell: "Not in revelry and drunkenness, not in licentiousness and lewdness, not in strife and envy; but put on the Lord Jesus Christ, and make no provision for the flesh, to fulfill its lusts." No further would I read, nor did I need to. For instantly at the end of this sentence, it seemed as if a light of serenity infused into my heart and all the darkness of doubt vanished away."