A man's errors are his portals of discovery.
I've learned that you can't have everything and do everything at the same time.
It's what you learn after you know it all that counts.
Education is learning what you didn't even know you didn't know
Whatever the cost of our libraries, the price is cheap compared to that of an ignorant nation.
Proper teaching is recognized with ease. You can know it without fail because it awakens within you that sensation which tells you this is something you have always known.
Life is the art of drawing without an eraser.
A good teacher must know the rules; a good pupil, the exceptions.
A man who has committed a mistake and doesn't correct it, is committing another mistake.
To be old can be glorious if one has not unlearned what it means to begin.