When you know a thing to recognize that you know it; and when you do not, to know that you do not know, - that is knowledge.
Confucius
Success is liking yourself, liking what you do, and liking how you do it.
Maya Angelou
The origins of disputes between philosophers is, that one class of them have undertaken to raise man by displaying his greatness, and the other to debase him by showing his miseries.
