"I love you," I say. I said that once, before I went to Erudite headquarters, but he was asleep then. I don't know why I didn't say it when he could hear it. Maybe I was afraid to trust him with something so personal as my devotion. Or afraid that I did not know what it was to love someone. But now I think the scary thing was not saying it before it was too late. Not saying it before it was almost too late for me."

Source: Veronica Roth (2014). “Divergent Series Ultimate Four-Book Collection: Divergent; Insurgent; Allegiant; Four”, p.75, Harper Collins