Physics is like sex: sure, it may give some practical results, but that's not why we do it.

There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.

What is now proved was once only imagined.

Investigate, educate and organize the country must progress, productive works and industries are the main avenues at present next to education for the advancement of the country

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

I have just three things to teach: simplicity, patience, compassion. These three are your greatest treasures.

If the facts don't fit the theory, change the facts.

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

Necessity is the mother of invention.

The ability to observe without evaluating is the highest form of intelligence.

Intelligence plus character-that is the goal of true education.

Educate the children and it won't be necessary to punish the men.

I don't look on poetry as closed works. I feel they're going on all the time in my head and I occasionally snip off a length.

Don't learn to do, but learn in doing.

A thought is an idea in transit.

Many much-learned men have no intelligence.

Common sense is the collection of prejudices acquired by age eighteen.

Reading without reflecting is like eating without digesting.

Patience is a virtue, and I'm learning patience. It's a tough lesson.

If help and salvation are to come, they can only come from the children, for the children are the makers of men.

Any sufficiently advanced technology is indistinguishable from magic.