If we know exactly where we're going, exactly how to get there, and exactly what we'll see along the way, we won't learn anything.

Learned we may be with another man's learning: we can only be wise with wisdom of our own.

Tact is the knack of making a point without making an enemy.

No act of kindness, no matter how small, is ever wasted.

What's real and what's true aren't necessarily the same.

There is nothing more uncommon than common sense.

An understanding of the natural world is a source of not only great curiosity, but great fulfilment.

Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating.

I think, therefore I am.

Work is the price which is paid for reputation.

Criticize the act, not the person.

Instinct is a marvellous thing. It can neither be explained nor ignored.

To avoid criticism say nothing, do nothing, be nothing.

How often it is that the angry man rages denial of what his inner self is telling him.

Judge not unless you judge yourself.

Desire is the very essence of man.

Challenges are gifts that force us to search for a new center of gravity. Don't fight them. Just find a new way to stand.

All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident.

Rational discussion is useful only when there is a significant base of shared assumptions.

Forget not that the earth delights to feel your bare feet and the winds long to play with your hair.

Desire, ignorance, and inequality—this is the trinity of bondage.