A mistake is always forgivable, rarely excusable and always unacceptable.
Don't take tomorrow to bed with you.
What's done can't be undone.
Dark and difficult times lie ahead. Soon we must all face the choice between what is right and what is easy.
He who is slowest in making a promise is most faithful in its performance.
What lies behind us and what lies ahead of us are tiny matters compared to what lives within us.
Wise men speak because they have something to say; Fools because they have to say something.
I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel.
To be wronged is nothing unless you continue to remember it.
No one cares how much you know, until they know how much you care
But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright brothers. But they also laughed at Bozo the Clown.
Those who see the invisible can do the impossible.
Better beggar woman and single than Queen and married.
An understanding of the natural world is a source of not only great curiosity, but great fulfilment.
Where you stand depends on where you sit.
Nobody has the power to take two steps together; you can take only one step at a time.
Doubt is the origin of wisdom
Whatever you think the world is withholding from you, you are withholding from the world.
Work is the price which is paid for reputation.
The trouble with most of us is that we would rather be ruined by praise than saved by criticism.
Accuracy is the twin brother of honesty; inaccuracy, of dishonesty.