I am not young enough to know everything.

Oscar Wilde

Courage is what it takes to stand up and speak; courage is also what it takes to sit down and listen.

Sir Winston Churchill

It is unwise to be too sure of one's own wisdom. It is healthy to be reminded that the strongest might weaken and the wisest might err.

Mahatma Gandhi

Attitude is a little thing that makes a big difference.

Sir Winston Churchill

A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.

Sir Winston Churchill

I am thankful for laughter, except when milk comes out of my nose.

Woody Allen

Is there anyone so wise as to learn by the experience of others?

Voltaire