The only good is knowledge and the only evil is ignorance.
如果你想飞翔,就必须放弃那些拖累你的事物。
When you get an invitation to do something in the future, ask yourself: would you accept this if it was scheduled for tomorrow? Not too many promises will pass that immediacy filter.
恐龙灭绝是因为它们没有太空计划。如果我们因为没有太空计划而灭绝,那是我们活该!
Don't let yesterday take up too much of today.