Experience without theory is blind, but theory without experience is mere intellectual play.

The spirit of man is an inward flame; a lamp the world blows upon but never puts out.

Self-esteem comes from being able to define the world in your own terms and refusing to abide by the judgments of others.

I am not a saint, unless you think of a saint as a sinner who keeps on trying.

No flying machine will ever fly from New York to Paris.

The promise given was a necessity of the past: the word broken is a necessity of the present.

The dogmas of the quiet past are inadequate to the stormy present. The occasion is piled high with difficulty, and we must rise with the occasion. As our case is new, so we must think anew and act anew.

If one is to be called a liar, one may as well make an effort to deserve the name.

I will not let anyone walk through my mind with their dirty feet.

I do not argue with obstinate men. I act in spite of them.

When it is not in our power to determine what is true, we ought to follow what is most probable.

We can't become what we need to be by remaining what we are.

It is a process of diverting one's scattered forces into one powerful channel.

Your clothes conceal much of your beauty, yet they hide not the unbeautiful

Every man's memory is his private literature.

Delay always breeds danger. To protract a great design is often to ruin it.

Remember upon the conduct of each depends the fate of all.

You sort of start thinking anything's possible if you've got enough nerve.

If we all worked on the assumption that what is accepted as true is really true, there would be little hope of advance.

All tyranny needs to gain a foothold is for people of good conscience to remain silent.

Christmas to a child is the first terrible proof that to travel hopefully is better than to arrive.