To show that GOD gave us His Standards and gave us jobs/careers on earth so that He can demote and promote us, we are working for the LORD and not to men.
Are you the LORD's worker?
Yes. 2 Timothy 2:15
2 Timothy 2:15 (Amplified Bible)
Study and be eager and do your utmost to present yourself to God approved (tested by trial), a workman who has no cause to be ashamed, correctly analyzing and accurately dividing [rightly handling