Psalms 107:20

20He sendeth his word. Again, in saying that they are delivered from destruction, the prophet shows that he is here alluding to those diseases which, in the opinion of men, are incurable, and from which few are delivered. Besides, he contrasts God’s assistance with all the remedies which are in the power of man to apply; as if he should say, that their disease having baffled the skill of earthly physicians, their recovery has been entirely owing to the exertion of God’s power. It is proper also to notice the manner in which their recovery is effected; God has but to will it, or to speak the word, and instantly all diseases, and even death itself, are expelled. I do not regard this as exclusively referring to the faithful, as many expositors do. I own, indeed, that it is of comparatively little consequence to us to be the subjects of bodily care, if our souls still remain unsanctified by the word of God; and hence it is the intention of the prophet that we consider the mercy of God as extending to the evil and unthankful. The meaning of the passage, therefore, is, that diseases neither come upon us by chance, nor are to be ascribed to natural causes alone, but are to be viewed as God’s messengers executing his commands; so that we must believe that the same person that sent them can easily remove them, and for this purpose he has only to speak the word. And since we now perceive the drift of the passage, we ought to attend to the very appropriate analogy contained in it. Corporeal maladies are not removed except by the word or command of God, much less are men’s souls restored to the enjoyment of spiritual life, except this word be apprehended by faith.