(Col 3:22). Seeking to please their masters only so long as these have their eyes on them: as Gehazi was a very different man in his master’s presence from what he was in his absence (2Ki 5:1-18).
men-pleasers - not Christ-pleasers (compare Gal 1:10; 1Th 2:4).
doing the will of God - the unseen but ever present Master: the best guarantee for your serving faithfully your earthly master alike when present and when absent.
from the heart - literally, soul (Psa 111:1; Rom 13:5).