I don't know it it's either, or even a syllogism. The conclusion is not stated in the verses. In vs. 17 it reads "So then faith cometh by hearing, and hearing by the word of God." (Of course, this is also telling what a preacher should be preaching)

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Timothy Johnson
First United Presbyterian of Moline
PCUSA (Yea, I know)
Theology/Philosophy Sunday School Teacher
Davenport, IA