(15) Not for that we have dominion over your faith, but are helpers of your (a) joy: for by faith ye stand.
(15) He removes all suspicion of arrogance, declaring that he speaks not as a lord to them, but as a servant, appointed by God to comfort them.
(a) He sets the joy and peace of conscience, which God is author of, as opposed to tyrannous fear, and in addition shows the result of the Gospel.