the set of someone's characteristics, such as personality and ability, that are not physical and make that person different from other people

The hero of the movie finally finds his true self (= discovers what his true personality and feelings are). 电影的主角最终找到了真正的自我。

When I saw them this afternoon they were more like their old/normal selves (= as they were in the past). 我今天下午见到他们的时候，他们更像是平时的老样子了。

a sense of self 自我意识

interest only in your own advantage

Her reply was typical of her constant regard for self. 她的答复明显说明她一贯只想着私利。

unto thine own self be trueidiom saying 只做自己认为对的事情。

of or by yourself or itself

self-educated 自学的

a self-winding watch 自动上发条的手表