It's Not sacrifice if it's someone else's life you're giving away, it's just evil.

Four!" I call out. Why am I calling a number? Oh yes. Because that's his name. — Tris.

One choice can transform you!

Arrogance is one of the flaws in the Erudite heart -- I know. It is often in mine.

Those who blamed aggression formed Amity.’… ‘Those who blamed ignorance became the Erudite.’… ‘Those who blamed duplicity created Candor.’… ‘Those who blamed selfishness made Abnegation.’… ‘And those who blamed cowardice were the Dauntless.

I wake wondering how I did not notice, every day I sat across from her at the breakfast table, that she was full to bursting with Dauntless energy. Was it because she hid it well? Or was it because I wasn't looking?

Dead people can be our heroes because they can't disappoint us later; they only improve over time, as we forget more and more about them.