The past guarantees you nothing in the future if the rules change.

The ultimate function of prophecy is not to tell the future, but to make it. Your successful past will block your visions of the future.

Vision without action is merely a dream. Action without vision just passes the time. Vision with action can change the world.

When you drop any new idea in the pond of the world, you get a ripple effect. You have to be aware that you will be creating a cascade of change.

Change is the law of life. And those who look only to the past or the present are certain to miss the future.

[Address in the Assembly Hall at the Paulskirche in Frankfurt, June 26 1963]

When you think about it, if the fittest always won, all forests should be completely homogeneous. One species should supplant all others as the most superior competitor. But it doesn't happen that way. Nor does it happen that way in the marketplace.