Webster(i)
16 For though I preach the gospel, I have nothing to boast of: for necessity is laid upon me; and woe is to me, if I preach not the gospel!
17 For if I do this thing willingly, I have a reward: but if against my will, a dispensation of the gospel is committed to me.
18 What is my reward then? Verily that, when I preach the gospel, I may make the gospel of Christ without charge, that I may not abuse my power in the gospel.