You have to keep thinking about what you can do to make the world a better place.

Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.

In preparing for battle I have always found that plans are useless， but planning is indispensable.