Be of good courage, and he shall strengthen your heart, all ye that hope in the LORD. Be of good courage, and he shall strengthen your heart - In 1 Corinthians 16:13, St. Paul says, "Watch ye, stand fast in the faith; quit you like men; be strong:" Γρηγορειτε, στηκετε εν τῃ πιστει, ανδριζεσθε, κραταιουσθε. The latter words he seems to have borrowed from the Septuagint, who translate, "Be of good courage, and he shall strengthen your heart," by Ανδριζεσθε και κραταιουσθω ἡ καρδια ὑμων "Act like men, and your hearts shall be strengthened." They that hope in God, and are endeavoring to walk carefully before him, may take courage at all times, and expect the fullness of the blessing of the Gospel of peace.
Commentary on the Bible, by Adam Clarke [1831].