Halakhah do Lamentacje Jeremiasza 3:33

And so does the verse state, "For He does not oppress from His heart, nor bring grief to man" (Lamentations 3:33). And it is also written, "For You are not a God who desires wickedness, etc." (Psalms 5:5) - meaning to say that God, may He be blessed, does not obligate liability to any creature from His desire for the liability, as the good God always desires good. Rather, it is a man who makes himself liable in his moving from righteousness; and [so] removes from himself the preparations that allow him to receive the good. And the parable for this is the one who walks on a straight path that is free of stones and from anything that makes one stumble, but there is a hedge of thorns from this [side] and from that [side]. And one went and rubbed the hedge and was hurt - truthfully, one cannot say about this man that God desired his hurt. [Rather,] he was the cause, since he was not careful to walk straight. And so too, with one who sins, it is the attribute of justice that makes him liable for his sin regardless. And one cannot say that the good God desired his liability. [Rather,] in his preventing himself from the good, from the angle of his sin, did evil become [drawn] found to him. And similar to this thing did they, may their memory be blessed, say - "No evil thing descends from Above" (Bereshit Rabbah 51:3).

What I have written many times about previous commandments is from the roots of this commandment - that man is acted upon according to his actions that he does. As since he is a physical being, he is not impacted by something in potential, until he takes matters from the potential to the actual. Hence when a punishment of an incident of death of one of his relatives - about which it is natural for him to love them - comes to him, the Torah obligates him to do acts with himself that arouse him to focus his thoughts on the anguish that has come to him. And then he will know and contemplate to himself that his iniquities caused it to him, that this anguish came upon him. As God, may He be blessed, 'does not afflict man from His heart, nor causes woe to the sons of man,' except from the angle of sins. And this is our - we, the practitioners of the precious Jewish faith - perfect belief. And when a man puts this matter into his heart with the act of mourning, he will move his mind to repent and improve his deeds, according to his ability. And behold, we have found with this a great benefit for people in the commandment of mourning. But the heretics that want to be wise that make empty the matters of the world and the acts of God, may He be blessed, place perversity and evil on their hearts: They make the death of the sons of man dependent on the happenstance of time, and think - in their evil thoughts - that 'the incident of man and beast, it is the same incident for them; and like the death of one is the death of the other.' And hence they wrote in their books - they should only be burnt - "Unfortunate is the one who worries [about this] at all." And in order to uproot and to pull out this evil belief of theirs from our hearts, the Torah obligated us in this commandment. [This is] besides the benefit of what we mentioned.