'Profit' in the Bible

What is the Almighty, that we should serve him? and what profit should we have, if we pray unto him?

Yea, whereto might the strength of their hands profit me, in whom old age was perished?

For thou saidst, What advantage will it be unto thee? and, What profit shall I have, if I be cleansed from my sin?

Thy wickedness may hurt a man as thou art; and thy righteousness may profit the son of man.