Once and for all, there are many things I choose not to know.-Wisdom sets limits even to knowledge.

Learning without thought is labor lost; thought without learning is perilous.

He who has access to the fountain does not go to the water-pot.

The man of knowledge must be able not only to love his enemies but also to hate his friends.

Share your knowledge. It is a way to achieve immortality.

Where there is shouting, there is no true knowledge.