The past is a shadow, always following, but never catching up.

The first duty of the sovereign， that of protecting the society from the violence and invasion of other independent societies， can be performed only by means of a military force.

我鼓励你接受你可能现在看不到一条路，但这并不意味着它不存在。

Quality is not an act, it is a habit.

Science is not only a discipline of reason but also one of romance and passion.