Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers.
书籍是最安静、最恒久的朋友；它们是最易接近、最睿智的顾问，也是最耐心的老师。
行为由当前刺激情境和过去的强化历史决定。
The truth is a beautiful and terrible thing, and should therefore be treated with great caution.
I don't think about my legacy. I'm just doing what I love.
He has not learned the first lesson of life who does not every day surmount a fear.