You have to have confidence in your ability, and then be tough enough to follow through.

有权势的天子，也未必尊贵；穷苦的平民，也未必低贱。贵贱的分别，在于行为的美恶。

失意之事，大多是由于洋洋得意所致。

The very existence of libraries affords the best evidence that we may yet have hope for the future of man.

Science is simply common sense at its best—that is, rigidly accurate in observation, and merciless to fallacy in logic.  

The advantage of a ridiculously ambitious goal is that it sets the bar very high so even in failure it may be a success measured by the ordinary.