Everything we do, we are to do it unto God. We will be rewarded for those things we do good, and we will receive wrong for what we have done wrong.
If you are deceiving others, and treating people wrong, you are doing it to yourself, because it will come back to you. If you are helping and treating others good, you are doing it to yourself, and will be rewarded for your good deeds.
Whatever you do, do it wholeheartedly to God.
Colossians 3:23-25 (KJV) – and whatsoever ye do, do it heartily, as to the Lord, and not unto men; knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ. But he that doeth wrong shall receive for the wrong which he hath done: and there is no respect of persons.