Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
A person who never made a mistake never tried anything new.
I have lived to prove Thoreau's contention that a man is rich in proportion to the number of things which he can afford to let alone.
Hell! there ain't no rules around here! We are tryin' to accomplish somep'n!
If at first the idea is not absurd, then there is no hope for it.
The only sure way to avoid making mistakes is to have no new ideas.