Difficulties are meant to arouse, not discourage. The human spirit is to grow strong by conflict.  困难是用来激励人心的，而不是使人气馁。人的心灵将因挫折而茁壮成长。
Unless you try to do something beyond what you have already mastered, you will never grow.
只有去尝试做一些你不熟悉的事情你才能有所成长。
一个从未犯错的人是因为他不曾尝试新鲜事物。