I believe that while the text may say "servant", the explanation given from the Greek denotes a much more than just a "hired hand". I believe that just as slaves were bought, so too, we were bought at a price-Jesus redemptive work at the cross. Having been bought, we are then, in turn given a special designation as saints-to be a slave to our Master-our God first and foremost.
I confess I cringe at times when a person is chosen for "sainthood". As believers, while not perfect, we are all saints
Therefore, the two together say to me that I am "the property of Jesus, bought by Him, for God's sole(soul ) use. Set apart to serve Him first.