Oh dear, I couldn't narrow it down. I love 'em all.
I think there is a world market for maybe five computers. - Thomas Watson, chairman of IBM, 1943.
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime. - Mark Twain
Religion is an insult to human dignity. With or without it, you'd have good people doing good things and evil people doing bad things, but for good people to do bad things, it takes religion. - Steven Weinberg
To give pleasure to a single heart by a single act is better than a thousand heads bowing in prayer. - Mahatma Gandhi
The ultimate measure of a person is not where one stands in moments of comfort and convenience, but where one stands at times of challenge and controversy. - Dr. Martin Luther King, Jr.
Nothing in the world can take the place of persistence.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent. The slogan "press on" has solved, and always will solve, the problems of the human race. - Calvin Coolidge (I think?)