You can do anything you think you can. This knowledge is literally the

gift of the gods, for through it you can solve every human problem. It should make of you an incurable optimist. It is the open door.
Robert Collier

I've searched all the parks in all the cities and found no statues of committees.
Gilbert K. Chesterton

The most powerful weapon on earth is the human soul on fire.
Ferdinand Foch

With self-discipline most anything is possible.
Theodore Roosevelt

You can't get a cup of tea big enough or a book long enough to suit me.
C. S. Lewis

Giving is true having.
Charles Spurgeon

Great men hallow a whole people, and lift up all who live in their time.
Sydney Smith