The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
If you don't go through the tough times, you don't get to the good times.
People fear what they don't understand and hate what they can't conquer.
My greatest anxiety arises from the apprehension that I shall not be able to complete the work I have undertaken in the manner I wish.
解释：看到兔子再回头唤猎狗，还不算太晚；跑掉了羊再去修补羊圈，也不算太迟。
I don't want to be as good as I was, I want to be better than I was.