Matthew Henry on Psalms 41:1-4

The people of God are not free from poverty, sickness, or outward affliction, but the Lord will consider their case, and send due supplies. From his Lord's example the believer learns to consider his poor and afflicted brethren. This branch of godliness is usually recompensed with temporal blessings. But nothing is so distressing to the contrite believer, as a fear or sense of the Divine displeasure, or of sin in his heart. Sin is the sickness of the soul; pardoning mercy heals it, renewing grace heals it, and for this spiritual healing we should be more earnest than for bodily health.