At times I think and at times I am.
I think; therefore I am.
We must be our own before we can be another's.
When one teaches, two learn.
The place to improve the world is first in one's own heart and head and hands.
Be sure your wisest words are those you do not say.
It isn't the mountain ahead that wears you out; it's the grain of sand in your shoe.
All action results from thought, so it is thoughts that matter.
Many a man curses the rain that falls upon his head, and knows not that it brings abundance to drive away the hunger.
You can't be taught to be brainy. You've either got it or you don't.
I believe things cannot make themselves impossible.
No snowflake in an avalanche ever feels responsible.
Rough diamonds may sometimes be mistaken for worthless pebbles.
The rung of a ladder was never meant to rest upon, but only to hold a man's foot long enough to enable him to put the other somewhat higher.
In matters of style, swim with the current; in matters of principle, stand like a rock.
Nobody cares how much you know, until they know how much you care.
If you do what you've always done, you'll get what you've always gotten.
Many people, including some conservatives, have been very impressed with how brainy the president and his advisers are. But that is not quite as reassuring as it might seem.
One can resist the invasion of an army but one cannot resist the invasion of ideas.
Judge a man by his questions rather than his answers.
Think for yourselves and let others enjoy the privilege to do so, too.