Translation of "Oneself" in Chinese

One should see oneself with one's neighbour's eye.

当局者迷，旁观者清。

To have doubts about oneself is the first sign of intelligence.

自我怀疑是聪明的第一标志。

Nowadays it's not possible to protect oneself against weapons of mass destruction.

如今要保护自己不受大规模杀伤性武器的伤害是不可能的。

It is presently very difficult to calm down and treat oneself with a book.

现在很难静下心来好好看一本书。