Knowing yourself is the beginning of all wisdom.
A wise man gets more use from his enemies than a fool from his friends.
Sometimes it's not enough to know what things mean, sometimes you have to know what things don't mean.
We learn from failure, not from success!
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.
The journey is what brings us happiness not the destination.