What's real and what's true aren't necessarily the same.
Gravity is only the bark of wisdom's tree; but it preserves it
Don't expect to build up the weak by pulling down the strong.
Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating.
Yesterday I was clever, so I wanted to change the world. Today I am wise, so I am changing myself.
The absent are never without fault, nor the present without excuse.
Kind words don't cost much. Yet they accomplish much.
Just remember, once you're over the hill you begin to pick up speed.
No man has any natural authority over his fellow men.
It is not enough to have a good mind; the main thing is to use it well.
A mistake is always forgivable, rarely excusable and always unacceptable.
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.
Courage is resistance to fear, mastery of fear - not absence of fear.
Every aquarium will eventually leak.
A scholar who cherishes the love of comfort is not fit to be deemed a scholar.
If you have no problems, then you have no clue to what is going.
One never notices what has been done; one can only see what remains to be done.
Reality leaves a lot to the imagination.
Nobody has the power to take two steps together; you can take only one step at a time.
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.
To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact