That is, see that he has surrendered his faith. Even though destiny has been fixed at the close of probation (see on ch. 22:11), God’s people must not relax their vigilance. Rather, they must become increasingly alert as Satan intensifies his deceptions.
They.
Probably meaning people generally.
Lest he walk naked.
That is, lose his garment of character as a result of yielding his faith. Compare ch. 17:16.
Keepeth his garments.
That is, remains steadfast in faith and character and wholly loyal to God. See on Matt. 22:11.
He that watcheth.
See on Matt. 24:42. The saints are to be alert and vigilant, lest they be deceived (see above on “I come as a thief”).