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

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

The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.

It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.

It seems essential, in relationships and all tasks, that we concentrate only on what is most significant and important.

Knowledge speaks, but wisdom listens

The heart has its reasons which reason knows not.

If you buy what you do not need, you will need what you cannot buy.

Time flies over us, but leaves its shadow behind.

Gravity is only the bark of wisdom's tree; but it preserves it

Everything excellent is as difficult as it is rare.

There are no limitations to the mind except those we acknowledge.

You laugh at me because I'm different, I laugh at you because you're all the same.

The greatest of wealth is the richness of the soul.

The only way to get the best of an argument is to avoid it.

Those who can not change their minds can not change anything.

Think globally, act locally.

Whatever it is you're seeking won't come in the form you're expecting.

Don't criticize what you can't understand.

Beer: The cause of, and solution to, all of life's problems.

What a man does for others, not what they do for him, gives him immortality.