Before everything else, getting ready is the secret of success.
The unhappiest man on earth is the one who has nothing to do.
History doesn't mean dates and wars and textbooks to me; it means the unconquerable pioneer spirit of man.
If you need a machine and don't buy it, then you will ultimately find that you have paid for it and don't have it.
Whether we think we can or cannot, we are right.
Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.