言而必有信,期而必当,天下之高行也。
【大意】说话一定要讲信用,约定了就一定要做到,这是天下的高尚行为。
The moment you doubt whether you can fly, you cease forever to be able to do it.
Success comes from focusing on what you can control and letting go of what you can't.
Mathematics is the key to understanding the universe.
Investing in technology is investing in the future of energy.