You can't know, you can only believe - or not.
Great minds are always feared by lesser minds.
A little knowledge is a dangerous thing. So is a lot.
Whatever in creation exists without my knowledge exists without my consent.
An investment in knowledge pays the best interest.
Knowledge comes, but wisdom lingers.
To not say all that can be said is the secret of discipline and economy.
Unless you try to do something beyond what you have already mastered, you will never grow.
Whoever submits himself to a super-discipline can expect great triumphs.
It is sometimes easier to be happy if you don't know everything.
