When the Bubonic Plague came to Luther’s town, he addressed it with the punch and pastoral heart we expect from Martin Luther. I’ve bolded the best quote.
This I well know, that if it were Christ or his mother who were laid low by illness, everybody would be so solicitous and would gladly become a servant or helper. Everyone would want to be bold and fearless; nobody would flee but everyone would come running. And yet they don’t hear what Christ himself says, “As you did to one of the least, you did it to me” [Matt. 25:40]. When Jesus speaks of the greatest commandment he says, “The other commandment is like it, you shall love your neighbor as yourself” [Matt. 22:39]. There you hear that the command to love your neighbor is equal to the greatest commandment to love God, and that what you do or fail to do for your neighbor means doing the same to God. If you wish to serve Christ and to wait on him, very well, you have your sick neighbor close at hand. Go to him and serve him, and you will surely find Christ in him, not outwardly but in his word. If you do not wish or care to serve your neighbor you can be sure that if Christ lay there instead you would not do so either and would let him lie there. Those are nothing but illusions on your part which puff you up with vain pride, namely, that you would really serve Christ if he were there in person. Those are nothing but lies; whoever wants to serve Christ in person would surely serve his neighbor as well. This is said as an admonition and encouragement against fear and a disgraceful flight to which the devil would tempt us so that we would disregard God’s command in our dealings with our neighbor and so we would fall into sin on the left hand.
Others sin on the right hand. They are much too rash and reckless, tempting God and disregarding everything which might counteract death and the plague. They disdain the use of medicines; they do not avoid places and persons infected by the plague, but lightheartedly make sport of it and wish to prove how independent they are. They say that it is God’s punishment; if he wants to protect them he can do so without medicines or our carefulness. This is not trusting God but tempting him. God has created medicines and provided us with intelligence to guard and take good care of the body so that we can live in good health.
If one makes no use of intelligence or medicine when he could do so without detriment to his neighbor, such a person injures his body and must beware lest he become a suicide in God’s eyes. By the same reasoning a person might forego eating and drinking, clothing and shelter, and boldly proclaim his faith that if God wanted to preserve him from starvation and cold, he could do so without food and clothing. Actually that would be suicide. It is even more shameful for a person to pay no heed to his own body and to fail to protect it against the plague the best he is able, and then to infect and poison others who might have remained alive if he had taken care of his body as he should have. He is thus responsible before God for his neighbor’s death and is a murderer many times over. Indeed, such people behave as though a house were burning in the city and nobody were trying to put the fire out. Instead they give leeway to the flames so that the whole city is consumed, saying that if God so willed, he could save the city without water to quench the fire.
No, my dear friends, that is no good. Use medicine; take potions which can help you; fumigate house, yard, and street; shun persons and places wherever your neighbor does not need your presence or has recovered, and act like a man who wants to help put out the burning city. What else is the epidemic but a fire which instead of consuming wood and straw devours life and body? You ought to think this way: “Very well, by God’s decree the enemy has sent us poison and deadly offal. Therefore I shall ask God mercifully to protect us. Then I shall fumigate, help purify the air, administer medicine, and take it. I shall avoid places and persons where my presence is not needed in order not to become contaminated and thus perchance infect and pollute others, and so cause their death as a result of my negligence. If God should wish to take me, he will surely find me and I have done what he has expected of me and so I am not responsible for either my own death or the death of others. If my neighbor needs me, however, I shall not avoid place or person but will go freely, as stated above.” See, this is such a God-fearing faith because it is neither brash nor foolhardy and does not tempt God.
— Whether One May Flee From a Deadly Plague (1527)
Martin Luther, Martin Luther’s Basic Theological Writings, ed. William R. Russell and Timothy F. Lull, Third Edition. (Minneapolis, MN: Fortress Press, 2012), 482–483.