Are these sentences ok and natural? Or what would you say?
Human being thinks about himself first.
Human being cares about himself first.
Human being loves himself first.

Question

Answer

In English, we always use a definite article (the) or an indefinite article (a/an) before a noun. In this case, to make the sentences sound natural, it should be:

A human being thinks about himself first.
A human being cares about himself first.
A human being loves himself first.