It is not enough to observe and experiment, theorize and calculate. One must also imagine.
大多数人发现他们从未后悔的事情只是他们的错误，但发现时已经太晚了。
The best leaders are those who listen more than they speak and act with integrity.
Liberty cannot be preserved without a general knowledge among the people.
自然不作飞跃。（拉丁文，指自然界的演变是连续的而非跳跃的）