Never boast of what you know. The more one knows, the more he realizes how ignorant he is. Socrates used to say: Hoc unum scio me nihi scire. [I know only one thing: that I know nothing.] So be humble; first, by being convinced that you know nothing; secondly, by never using your knowledge for evil purposes; finally, by knowing what Jesus Christ teaches us – to forgive injuries received, to forgive our enemies.
–Saint John Bosco (1815-1888)