Prosperity is a great teacher; adversity a greater.

I have learned that success is to be measured not so much by the position that one has reached in life as by the obstacles which he has overcome while trying to succeed.

The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy.

If you want the rainbow, you've got to put up with the rain.

So it is more useful to watch a man in time of peril, and in adversity to discern what kind of man he is; for then at last words of truth are drawn from the depths of his heart, and the mask it torn off, reality remains.

What signifies knowing the names, if you know not the nature of things?

The value of a college education is not the learning of many facts but the training of the mind to think.

Our destiny exercises its influence over us even when, as yet, we have not learned its nature; it is our future that lays down the law of our today.

If a man empties his purse into his head, no man can take it away from him. An investment in knowledge always pays the best interest.

Read, read, read. Never stop reading. And when you can't read anymore… write.

A learned blockhead is a greater blockhead than an ignorant one.

Do not be embarrassed by your mistakes. Nothing can teach us better than our understanding of them. This is one of the best ways of self-education.

You teach best what you most need to learn.

If all our misfortunes were laid in one common heap, whence every one must take an equal portion, most people would be contented to take their own and depart.

The successful man will profit from his mistakes and try again in a different way.

There will be obstacles. There will be doubters. There will be mistakes. But with hard work, there are no limits.

The opposite is beneficial; from things that differ comes the fastest fairest attunement; all things are born through strife.

Sometimes when you innovate, you make mistakes. It is best to admit them quickly, and get on with improving your other innovations.