Salmos 27:14

Wait on the Lord
This, with what follows, is spoken by the psalmist either to himself or to others, or it may be to both, upon the rich experience he declares in ( Psalms 27:13 ) : it becomes believers to wait on the Lord for the common blessings of life, for even the eyes of all wait upon him for their daily food; and for the light of his countenance, when it is withdrawn from them, for he will return again at the set time; and for answers of prayer, which will be given sooner or later; and for the performance of his promises, which are yea and amen in Christ: they should wait upon him in his house and ordinances constantly, with reverence and godly fear; they should wait upon him as servants on their masters, observe his orders, and diligently execute them; and, as beggars for their alms, they should knock and wait at Wisdom's gates, tell their case and wait, take repulses and wait, and, when they succeed, give thanks. It is good to wait upon the Lord; many are the favours and blessings such receive now, and eye has not seen what God has prepared for them that wait for him;

be of good courage;
the saints have need of courage, considering the enemies they have to grapple with; the corruptions of their own hearts, the enemies of a man's own house; the worst of all, Satan, and his principalities and powers; and men of the world, and a world of them: and they have great reason, notwithstanding, be of good courage, since God is for them; Christ is the Captain of their salvation; the Holy Spirit, that is in them, is greater than he that is in the world; angels encamp around them; they are provided with the whole armour of God; they are engaged in a good cause, are sure of victory, and shall wear the crown of righteousness; and it follows,

and he shall strengthen thine heart;
that is, the Lord will do it, as he has promised to them that wait on him, ( Isaiah 40:31 ) ( 41:10 ) ; or "let thine heart be strengthened": as the Septuagint render it; and so the Chaldee paraphrase, "strengthen thine heart"; taking it for an exhortation; as indeed it seems to be by what goes before and follows; see ( Joshua 1:6 Joshua 1:9 ) ;

wait, I say, on the Lord;
this is repeated, to express the importance of this duty, and to encourage to it.