en_tn_condensed/col/03/22.md

obey your masters according to the flesh

"obey your human masters"

things, not with eyeservice as people pleasers

"things. Do not obey only when your master is watching, as though you need only to please people"

with a sincere heart

"Heart" here is a metonym for a person's thoughts or intentions. Alternate translation: "with all honest intentions" or "with sincerity" (See: rc://en/ta/man/translate/figs-metonymy)