World Wide Study Bible
a Bible passage
14But solid food is for the mature, for those whose faculties have been trained by practice to distinguish good from evil.
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.