The only way a man can remain consistent amid changing circumstances is to change with them while preserving the same dominating purpose.

The oldest habit in the world for resisting change is to complain that unless the remedy to the disease should be universally applied it should not be applied at all. But you must start somewhere.

To improve is to change; to be perfect is to change often.

Do you want to spend the rest of your life selling sugared water or do you want a chance to change the world?

The philosophers have only interpreted the world, in various ways: the point, however, is to change it.

If today were the last day of my life, Would I want to do what I'm about to do today? And whenever the answer has been "no" for too many days in a row, I know I need to change something.