(17) For if any be a hearer of the word, and not a doer, he is like unto a man beholding his (u) natural face in a glass:
(17) Secondly: because they lose the most important use of God's word, if they do not use it to correct the faults that they know.
(u) He alludes to that natural stain, which is contrary to the purity that we are born again into, the living image which we see in the law.