Satan is the originator of disease; and the physician is warring against his work and power. Sickness of the mind prevails everywhere. Nine tenths of the diseases from which men suffer have their foundation here. Perhaps some living home trouble is, like a canker, eating to the very soul and weakening the life forces. Remorse for sin sometimes undermines the constitution and unbalances the mind. There are erroneous doctrines also, as that of an eternally burning hell and the endless torment of the wicked, that, by giving exaggerated and distorted views of the character of God, have produced the same result upon sensitive minds. Infidels have made the most of these unfortunate cases, attributing insanity to religion; but this is a gross libel and one which they will not be pleased to meet by and by. The religion of Christ, so far from being the cause of insanity, is one of its most effectual remedies; for it is a potent soother of the nerves. 2TT 143.3
The physician needs more than human wisdom and power that he may know how to minister to the many perplexing cases of disease of the mind and heart with which he is called to deal. If he is ignorant of the power of divine grace he cannot help the afflicted one, but will aggravate the difficulty; but if he has a firm hold upon God he will be able to help the diseased, distracted mind. He will be able to point his patients to Christ and teach them to carry all their cares and perplexities to the great Burden Bearer. 2TT 144.1
There is a divinely appointed connection between sin and disease. No physician can practice for a month without seeing this illustrated. He may ignore the fact; his mind may be so occupied with other matters that his attention will not be called to it; but if he will be observing and honest he cannot help acknowledging that sin and disease bear to each other the relationship of cause and effect. The physician should be quick to see this and to act accordingly. When he has gained the confidence of the afflicted by relieving their sufferings and bringing them back from the verge of the grave he may teach them that disease is the result of sin and that it is the fallen foe who seeks to allure them to health-and-soul-destroying practices. He may impress their minds with the necessity of denying self and obeying the laws of life and health. In the minds of the young especially he may instill right principles. 2TT 144.2
God loves His creatures with a love that is both tender and strong. He has established the laws of nature, but His laws are not arbitrary exactions. Every “Thou shalt not,” whether in physical or moral law, contains or implies a promise. If it is obeyed, blessings will attend our steps; if it is disobeyed, the result is danger and unhappiness. The laws of God are designed to bring His people closer to Himself. He will save them from the evil and lead them to the good if they will be led, but force them He never will. We cannot discern God's plans, but we must trust Him and show our faith by our works. ... 2TT 144.3