Nobody can think straight who does not work. Idleness warps the mind.

Thinking is the hardest work there is, which is probably the reason why so few engage in it.

Whether you think you can, or you think you can't--you're right.

…for when men labor they keep out of mischief. You remember the old proverb--An idle mind is the Devils workshop...

The way a man's mind runs is the way he is sure to go.

Coming together is a beginning. Keeping together is progress. Working together is success.