Natural abilities are like natural plants; they need pruning by study.

Consider the postage stamp: its usefulness consists in the ability to stick to one thing till it gets there.

There are some people who live in a dream world, and there are some who face reality; and then there are those who turn one into the other.

Whether you think you can or whether you think you can't, you're right!

The wind and the waves are always on the side of the ablest navigators.

Never tell a young person that anything cannot be done. God may have been waiting centuries for someone ignorant enough of the impossible to do that very thing.