我们都是自己的幽灵，游荡在自己的生命里。
外交是一种手段，而不是目的。
The iron rule of nature is: you get what you reward for. If you want ants to come, you put sugar on the floor.
La literatura es el único país donde puedo vivir sin pasaporte.
成功是日复一日重复小努力的总和。
最好的数学不仅正确，而且具有启发性。
In mathematics, truth is somewhere out there in a place we don’t yet know, and the only way we can hope to find it is by exploring.
Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government."