Matthew 6:16

Verse 16. Moreover when ye fast, etc. The word fast literally signifies to abstain from food and drink, whether from necessity or as a religious observance. It is, however, commonly applied in the Bible to the latter. It is, then, an expression of grief or sorrow. Such is the constitution of the body, that in a time of grief or sorrow we are not disposed to eat; or, we have no appetite. The grief of the soul is so absorbing as to destroy the natural appetites of the body. Men in deep affliction eat little, and often pine away and fall into sickness, because the body refuses, on account of the deep sorrow of the mind, to discharge the functions of health.