Every problem in mathematics is an opportunity to learn something new.
如果因为你的特立独行而在周围人中不受欢迎……那就随他们去吧。
我总是告诉我的孩子们,‘如果你要做某件事,就要做好。如果你不打算做好,那就干脆别做。’
Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence.
A person may cause evil to others not only by his actions but by his inaction, and in either case, he is justly accountable to them for the injury.