The only real mistake is the one from which we learn nothing.

When you learn, teach, when you get, give.

We are all born ignorant, but one must work hard to remain stupid

As the soft yield of water cleaves obstinate stone, So to yield with life solves the insolvable: To yield, I have learned, is to come back again.

Experience is merely the name men gave to their mistakes.

True knowledge lies in knowing how to live.

We must live together as brothers or perish together as fools.

Dark and difficult times lie ahead. Soon we must all face the choice between what is right and what is easy.

We thought that we had the answers, it was the questions we had wrong.

If you don't want to slip up tomorrow, speak the truth today.

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

It is not titles that honor men, but men that honor titles.

Knowing yourself is the beginning of all wisdom.

A man may imagine things that are false, but he can only understand things that are true.

There is no question climate change is happening. The only arguable point is what part humans are playing in it.

The ultimate authority must always rest with the individual's own reason and critical analysis.

Early to bed and early to rise, Makes a man healthy, wealthy, and wise.

The pendulum of the mind oscillates between sense and nonsense, not between right and wrong.

What's done can't be undone.

Don't expect to build up the weak by pulling down the strong.

Loneliness adds beauty to life. It puts a special burn on sunsets and makes night air smell better.