Be of good courage, and he shall strengthen your heart, all ye that hope in the LORD.

Psalms 31:24

The phrase 'Be of good courage. Speaks of' fastening upon, to be constant and be established.

For we know there will be moments when certain things and circumstances will attempt to make you lose faith, and other challenges will inundate your life. Even though you have faith in the Lord, there are moments when you are not constant in your fellowship with Him because other things consume your time more than your walk with the Lord. Consequently, you may find yourself feeling unstable and ungrounded.

But “Be of good courage,” that is, be constant and established. Therein lies the promise: the Lord shall strengthen your heart. For His mercy’s sake, as your hope remains in Him.