Be of good courage. This exhortation is to be understood in the same way as the preceding; for the steadfastness which the Psalmist here enjoins is founded on the love of God of which he had spoken, when renouncing all the enticements of the world, we embrace with our whole hearts the defense and protection which he promises to us. Nor is his exhortation to courage and firmness unnecessary; because, when any one begins to rely on God, he must lay his account with and arm himself for sustaining many assaults from Satan. We are first, then, calmly to commit ourselves to the protection and guardianship of God, and to endeavor to have the experience of his goodness pervading our whole minds. Secondly, thus furnished with steady firmness and unfailing strength, we are to stand prepared to sustain every day new conflicts. As no man, however, is able of himself to sustain these conflicts, David urges us to hope for and ask the spirit of fortitude from God, a matter particularly worthy of our notice. For hence we are taught, that when the Spirit of God puts us in mind of our duty, he examines not what each man's ability is, nor does he measure men's services by their own strength, but stimulates us rather to pray and beseech God to correct our defects, as it is he alone who can do this.

Be of good courage - See a similar exhortation at the close of a psalm, in Psalm 27:14. Compare the notes at that verse. As the result of all his own experience of the goodness of God, and of His gracious interposition in the time of danger, the psalmist exhorts others to be encouraged, and to feel assured that God would not leave or forsake them.
And he shall strengthen your heart - He will animate you; he will enable you to meet trial and opposition; he will keep you from becoming faint and disheartened.
All ye that hope in the Lord - All that put their trust in him, or all whose expectation is from him. It is a characteristic of true piety that all hope centers in God, or that the soul feels that there is no other ground of hope.
(a) The truly pious man despairs of success in anything else, or from any other quarter, for he feels that God alone can give success.
(b) He does hope in God - in reference to all that is needful for himself as an individual; all that will be for the good of his family; all that will tend to bless the world; all that he desires in heaven. Hope in God cheers him, sustains him, comforts him; makes life happy and prosperous; and makes death calm, serene, triumphant.

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 "Acts 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.

Be of good courage, and he shall (r) strengthen your heart, all ye that hope in the LORD.
(r) Be constant in your calling, and God will confirm you with heavenly strength.

Be of good courage, and he shall strengthen your heart,.... See Gill on Psalm 27:14; by this instance of God's wonderful kindness to the psalmist, he would have the saints take heart, and be of good cheer, even in the greatest distresses, since their case cannot be worse than his was; and yet he had deliverance out of it;
all ye that hope in the Lord; for the eye of the Lord is on such, and he takes delight in them, Psalm 33:18. The Targum is, "who hope for", or "trust in the word of the Lord"; the essential Word, the promised Messiah.