5:11-14 Dull hearers make the preaching of the gospel difficult, and even those who have some faith may be dull hearers, and slow to believe. Much is looked for from those to whom much is given. To be unskilful, denotes want of experience in the things of the gospel. Christian experience is a spiritual sense, taste, or relish of the goodness, sweetness, and excellence of the truths of the gospel. And no tongue can express the satisfaction which the soul receives, from a sense of Divine goodness, grace, and love to it in Christ.
14. strong meat—"solid food."
them … of full age—literally, "perfect": akin to "perfection" (Heb 6:1).
by reason of use—Greek, "habit."
senses—organs of sense.
exercised—similarly connected with "righteousness" in Heb 12:11.
to discern both good and evil—as a child no longer an infant (Isa 7:16): so able to distinguish between sound and unsound doctrine. The mere child puts into its mouth things hurtful and things nutritious, without discrimination: but not so the adult. Paul again alludes to their tendency not to discriminate, but to be carried about by strange doctrines, in Heb 13:9.