Charles H. Spurgeon on Psalms 41:3

The Lord will strengthen him upon the bed of languishing. The everlasting arms shall stay up his soul as friendly hands and downy pillows stay up the body of the sick. How tender and sympathising is this image; how near it brings our God to our infirmities and sicknesses! Whoever heard this of the old heathen Jove, or of the gods of India or China? This is language peculiar to the God of Israel; he it is who deigns to become nurse and attendant upon good men. If he smites with one hand he sustains with the other. Oh, it is blessed fainting when one falls upon the Lord's own bosom, and is borne up thereby! Grace is the best of restoratives; divine love is the noblest stimulant for a languishing patient; it makes the soul strong as a giant, even when the aching bones are breaking through the skin. No physician like the Lord, no tonic like his promise, no wine like his love. Thou wilt make all his bed in his sickness. What, doth the Lord turn bed maker to his sick children? Herein is love indeed. Who would not consider the poor if such be the promised reward? A bed soon grows hard when the body is weary with tossing to and fro upon it, but grace gives patience, and God's smile gives peace, and the bed is made soft because the man's heart is content; the pillows are downy because the head is peaceful. Note that the Lord will make all his bed, from head to foot. What considerate and indefatigable kindness! Our dear and ever blessed Lord Jesus, though in all respects an inheritor of this promise, for our sakes condescended to forego the blessing, and died on a cross and not upon a bed; yet, even there, he was after awhile upheld and cheered by the Lord his God, so that he died in triumph.

We must not imagine that the benediction pronounced in these three verses belongs to all who casually give money to the poor, or leave it in their wills, or contribute to societies. Such do well, or act from mere custom, as the case may be, but they are not here alluded to. The blessing is for those whose habit it is to love their neighbour as themselves, and who for Christ's sake feed the hungry and clothe the naked. To imagine a man to be a saint who does not consider the poor as he has ability, is to conceive the fruitless fig tree to be acceptable; there will be sharp dealing with many professors on this point in the day when the King cometh in his glory.

Verses 4-9. Here we have a controversy between the pleader and his God. He has been a tender friend to the poor, and yet in the hour of his need the promised assistance was not forthcoming. In our Lord's case there was a dark and dreary night in which such arguments were well befitting himself and his condition.