{I serve} (latreu(935c)). Old verb from latron, hire, and
latris, hireling, so to serve for hire, then to serve in
general gods or men, whether sacred services ( Heb 9:9  10:2 ) or
spiritual service as here. Cf.  Ro 12:1  Php 3:3 . {Unceasingly}
(adialeipt(9373)). Late adverb for which see  1Th 1:2f.  2:13  5:17 , only other N.T. examples. {Always} (pantote). One might
think that Paul prayed for no others, but he uses both adverbs in
 1Th 1:2 . He seems to have had prayer lists. He never omitted
the Romans.