了解自己极限的唯一方法就是超越它们。
The only way to know your limits is to go beyond them.
翻译:道德高尚的人,与地位比自己高的人交往,不奉承讨好;与地位比自己低的人交往,不轻慢高傲。
The only limit to our realization of tomorrow will be our doubts of today.