A few great minds are enough to endow humanity with monstrous power, but a few great hearts are not enough to make us worthy of using it.
We must watch over our modesty in the presence of those who cannot understand its grounds.
Think? Why think! We have computers to do that for us.
Nothing leads the scientist so astray as a premature truth.
A man is not old as long as he is seeking something.
In politics, yesterday's lie is attacked only to flatter today's.