...truth

Devotion to Truth:
Even after he has been convicted by the jury, Socrates declines to abandon his pursuit of the truth in all matters. Refusing to accept exile from Athens or a commitment to silence as his penalty, he maintains that public discussion of the great issues of life and virtue is a necessary part of any valuable human life. "The unexamined life is not worth living." (Apology 38a) Socrates would rather die than give up philosophy, and the jury seems happy to grant him that wish.

http://www.philosophypages.com/hy/2d.htm