Act as if the maxim of your action were to become through your will a general natural law

It has seemed to be more necessary to have regard to the weight of words rather than to their number.

It is neither good nor bad, but thinking makes it so.

The lie is a condition of life.

A friend to all is a friend to none

There are four ways, and only four ways, in which we have contact with the world. We are evaluated and classified by these four contacts: what we do, how we look, what we say, and how we say it.

Doubt is the origin of wisdom

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

Science may set limits to knowledge, but should not set limits to imagination.

Be realistic: Plan for a miracle

It is a cliche that most cliches are true, but then like most cliches, that cliche is untrue.

I believe that one defines oneself by reinvention. To not be like your parents. To not be like your friends. To be yourself. To cut yourself out of stone.

The greatest power we have is the power of choice.

Experience teaches us that it is much easier to prevent an enemy from posting themselves than it is to dislodge them after they have got possession.

Time flies over us, but leaves its shadow behind.

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

Don't take tomorrow to bed with you.

Let no man pull you low enough to hate him.

The greatest of all mistakes is to do nothing because you think you can only do a little

Every act of creation is first an act of destruction.

It is tact that is golden, not silence.