【感悟译吧】人的第一天职是做自己。

Man's first vocation is to be himself.
忍不住翻译一句，判我作弊也无所谓了。呵呵

The first day of man is to be himself.

Man's bounden duty is to be himself.
Man's first mission is to be himself.

vocation基本等同于occupation，通常用于具体职业。

to be oneself is the most important

Men's job is to be theirselves.

The first duty is to their own people