The peculiar evil of silencing the expression of an opinion is that it is robbing the human race； posterity as well as the existing generation； those who dissent from the opinion， still more than those who hold it.

可持续性不是一种选择；它是农业未来的必要条件。

数学的乐趣在于旅程，而不仅仅是目的地。

Time does not heal all wounds; some remain, becoming part of us.

I am a radical.

释义：不要遮蔽自己的良心，也不要张扬他人的过错。在与人交往时谨慎行事，就不会有懊恼；在处理事情时耐心商量，就能顺利解决。