The A. V. puts this as an independent apophthegm, which is wrong. The sentence is a comment and enlargement upon that man. “Let not that man think,” etc., “a double-minded man, unstable in all his ways.” So Rev.
Double-minded (δίψυχος)
Peculiar to James, here and Jam 4:8. Not deceitful, but dubious and undecided.
Unstable (ἀκατάστατος)
Only here in New Testament. The kindred ἀκαταστασία, confusion, is found Jam 3:16, and elsewhere.