"Hearts Touched With Fire: My 500 Favorite Inspirational Quotes" by Elizabeth Dole.

From the Introduction:

"For the past dozen or so years, my office has been graced by a photograph of Theodore Roosevelt. Beneath the photograph ar TR's words, spoken over a century ago, but which provide a timeless challenge to all those in public service: 'We are face to face with our destiny, and we must meet it with a high and resolute courage. For ours is the life of action, of strenuous performance of duty. Let us live in the harness, striving mightily. Let us  run the risk of wearing out, rather than rusting out.' 

I have included that quotation at the conclusion of many speeches, and it never fails to inspire the audience, and to remind me that a particularly compelling quote - inserted at just the right place - can transform a speech, making it more successful and more memorable. I agree wholeheartedly with Benjamin Disraeli, the great British prime minister, who said, "The wisdom of the wise and the experience of the ages are perpetuated by quotaions.'"