An investment in knowledge pays the best interest.

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

To every action there is always an equal and opposite or contrary, reaction

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

What is now proved was once only imagined.

Investigate, educate and organize.

The deepest sin against the human mind is to believe things without evidence.

I am indebted to my father for living, but to my teacher for living well.

To read is to fly: it is to soar to a point of vantage which gives a view over wide terrains of history, human variety, ideas, shared experience and the fruits of many inquiries.

A child miseducated is a child lost.

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

Imagination is more important than knowledge.

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

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

Reading without reflecting is like eating without digesting.

There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.

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

The first idea the child must acquire is that of the difference between good and evil.

Industrialize or perish.

A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.

Knowing others is wisdom, knowing yourself is Enlightenment.