Real knowledge is to know the extent of one's ignorance.

Learning gives creativity, Creativity leads to thinking, Thinking provides knowledge, Knowledge makes you great.

It is possible to fly without motors, but not without knowledge and skill.

The reading of all good books is like conversation with the finest men of past centuries.

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.

When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.

I do not know how to teach philosophy without becoming a disturber of the peace.

Knowledge becomes evil if the aim be not virtuous.

Just when I thought there wasn't room enough for another thought in my head, I had this great idea.

Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

Dare to think for yourself.

To educate a person in the mind but not in morals is to educate a menace to society.

Learning never exhausts the mind.

Knowledge, Action, Devotion are complementary to each other.

I have no special talents. I am only passionately curious.

Industrialize or perish.

Books are for people who wish they were somewhere else.

We could never learn to be brave and patient, if there were only joy in the world

No power and no treasure can outweigh the extension of our knowledge.

Many much-learned men have no intelligence.