There are no eternal facts, as there are no absolute truths.
Adapt what is useful, reject what is useless, and add what is specifically your own.
I dream. Sometimes I think that's the only right thing to do.
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
He that cannot reason is a fool. He that will not is a bigot. He that dare not is a slave.
The only way to get the best of an argument is to avoid it.
To do great things is difficult, but to command great things is more difficult.
Simplicity is the ultimate sophistication.
The simple things are also the most extraordinary things, and only the wise can see them.
Every aquarium will eventually leak.
No one cares how much you know, until they know how much you care
Science may set limits to knowledge, but should not set limits to imagination.
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.
The road of excess leads to the palace of wisdom.
There is always time to add a word, never to withdraw one.
You don't become what you want, you become what you believe
One who deceives will always find those who allow themselves to be deceived.
Do not pray for an easy life, pray for the strength to endure a difficult one.
Not everything that can be counted counts, and not everything that counts can be counted.
Experience is the only prophecy of wise men.
Learn from the mistakes of others. You can never live long enough to make them all yourself.