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

Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

You can never be overdressed or overeducated.

All stable processes we shall predict. All unstable processes we shall control.

I am so clever that sometimes I don't understand a single word of what I am saying.

Knowledge becomes evil if the aim be not virtuous.

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

The schools ain't what they used to be and never was.

Better know nothing than half-know many things.

You can never learn less, you can only learn more.

Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.

An investment in knowledge pays the best interest.

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.

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

All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.

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

Learning never exhausts the mind.

I am a part of everything that I have read.

Words can be like X-rays if you use them properly - they'll go through anything. You read and you?re pierced.

Many much-learned men have no intelligence.