Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
Albert Einstein
The quality, not the longevity, of one's life is what is important.
Martin Luther King, Jr.
Whatever you do may seem insignificant to you, but it is most important that you do it.
Mohandas Gandhi
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
Winston Churchill
Important principles may, and must, be inflexible.
Abraham Lincoln