For in much wisdom is much grief; and he that increaseth knowledge increaseth sorrow.

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

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

I am not young enough to know everything.

The true delight is in the finding out rather than in the knowing.

If knowledge can create problems, it is not through ignorance that we can solve them.

I would rather hire a man with enthusiasm, than a man who knows everything.

Those people who think they know everything are a great annoyance to those of us who do.

To introduce something altogether new would mean to begin all over, to become ignorant again, and to run the old, old risk of failing to learn.

Knowledge is indivisible. When people grow wise in one direction, they are sure to make it easier for themselves to grow wise in other directions as well. On the other hand, when they split up knowledge, concentrate on their own field, and scorn and ignore other fields, they grow less wise — even in their own field.

If money is your hope for independence you will never have it. The only real security that a man will have in this world is a reserve of knowledge, experience, and ability.

Apply these rules at every opportunity. If you don't you will forget them quickly. Only knowledge that is used sticks in your mind.

The great aim of education is not knowledge but action.

Suppose that we are wise enough to learn and know — and yet not wise enough to control our learning and knowledge, so that we use it to destroy ourselves? Even if that is so, knowledge remains better than ignorance.