Musar zu Dewarim 4:15

Perhaps you will say: behold we see that the sages everywhere obligated a man to guard himself well and not put himself in danger even if he is a righteous person with many merits. For instance: "everything is in the hands of heaven except colds and heatstrokes" (Ketubot 30a) and the Torah says "you shall guard yourselves very carefully" (Devarim 4:15). Hence one should not decide to "trust in G-d" in all situations, and in the Talmud Yerushalmi (Berachot 3, see also Chulin 142a) they said: "even when performing a Mitzva!".

But he is still not master over himself to keep his heart from being pulled by natural lusts so that they do not sway him to rationalize that certain things are permitted regarding the things whose evil is not so well known.

For even though he strives to conquer his evil inclination and to subdue his lusts, he will not change his nature because of this. He will not be able to remove bodily lust from his heart. He will at most be able to subdue it and be governed by wisdom instead of it. But nevertheless the darkness of the physical will inevitably do its work to entice and seduce him.

Yet, for everything there is an occasion, and for every experience, a time.¹²Compare Ecclesiastes 3:1-2. R. Salanter is saying that the epidemic has created a time for grief in our life. We also are pained by the untimely loss of life. Nevertheless, we should guide our emotions not to fear the plague. Now that this plague has appeared in the land, and even here—may the Merciful One save us—this is the teaching that should guide a person,¹³Compare II Samuel 7:19. The verse in II Samuel carries the overtone that this guidance is a gracious, unmerited gift from God. and this is common sense: Do not be afraid of [the disease] at all. For what is human life in any case? Who knows if his [future] path [in life] would have turned out [to be] upright. Furthermore, we must act in accordance with the wise doctors’ instructions - for our religion tells us to walk by the light of their words¹⁴Halakhah considers “you shall safeguard your lives very much” (Deut. 4:15) to be a mitzvah. Halakhah also rules that saving a life overrules all of the Torah’s commandments except for three. and thus uphold this life to be good and do good.

Behold, thus each person needs to seek the proper cure when he needs them. For if he will not do this and will cause "death without judgment", he will be held accountable for his life. And he is at fault [his death is worthwhile] for he transgressed on that that is written [in the Torah], "and you shall protect very well your life." [deut / devarim 4;15] And the person who does not preserve his health, and does not act in the according to nature, to seek the proper medical treatment of his illness, to the best of his ability - will surely be punished since he transgressed that which is written in the Torah. It also comes out that he depended on a miracle and if a miracle was done for him, a part of his merits will be taken away.