The oldest, shortest words- 'yes' and 'no'- are those which require the most thought.

You can best serve civilization by being against what usually passes for it.

If a man could have half of his wishes, he would double his troubles.

Where you stand depends on where you sit.

Peace is not an absence of war, it is a virtue, a state of mind, a disposition for benevolence, confidence, justice.

In order to change the world, you have to get your head together first

Good advice is always certain to be ignored, but that's no reason not to give it.

So many people have this idea: I want to achieve something great or be somebody great. And they neglect the step that leads to greatness. They don't honor this step at this moment because they have this idea of some future moment where they are going to be great.

Never pick a fight with an ugly person, they've got nothing to lose.

Science is organized knowledge. Wisdom is organized life.

Knowing yourself is the beginning of all wisdom.

It is easy to be brave at a safe distance.

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

None but ourselves can free our minds.

Judge a man by his questions rather than by his answers.

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

Each day is a little life; every waking and rising a little birth; every fresh morning a little youth; every going to rest and sleep a little death.

He who conquers others is strong; he who conquers himself is mighty.

Medicine heals diseases of the body, wisdom frees the soul from passions.

Wise men speak because they have something to say; Fools because they have to say something.

You always admire what you really don't understand.