For if I do this of mine own will, I have a reward: but if not of mine own will, I have a stewardship intrusted to me.

If my preaching is voluntary, I have a reward. But if it is not voluntary, I am still entrusted with a responsibility.

for if willing I do this, I have a reward; and if unwillingly--with a stewardship I have been entrusted!

For if I do this voluntarily, I have a reward; but if not of my own will, I am entrusted with an administration.