one of the greatest pleasure in life is conversation 

生活中最大的乐趣之一是交谈。

A lifetime of happiness ! No man alive could bear it it would be hell on earth .

终身幸福！这是任何活着的人都无法忍受的，那将是人间地狱。

Happiness is form courage .
幸福是勇气的一种形式。

perfect understanding will sometimes almost extinguish pleasure. 

完全的理解有时几乎会使乐趣消失。

It is not easy to find happiness in ourselves, and it is not possible to find it elsewhere.

要在自身找到幸福是不容易的,要在别的地方找到幸福则是不可能的。

never less idle than when wholly idle, nor less alone than when wholly alone.

要清闲就完全清闲，要清静就完全清静。

people who cannot find time for recreation are obliged sooner or later to find time for illness.

 腾不出时间娱乐的人，早晚会被迫腾出时间生病。