老年人相信一切，中年人怀疑一切，年轻人知道一切。

世界上充满了显而易见的事物，却没有人注意到它们。

The best agricultural solutions are often the simplest ones.

There are some things so serious you have to laugh at them.

Actions are right in proportion as they tend to promote happiness； wrong as they tend to produce the reverse of happiness.