Literature is the most subversive weapon because it changes minds, not by force, but by persuasion.
可持续发展不是一种选择;它是我们对后代的责任。
The only limits you have are the ones you set for yourself.
The only secure system is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards.
Be slow to fall into friendship,but when you are in,continue firm and constant.