Suffering is determined by Mazel

 Zohar (Bereishis 180b) Where is the cheerful spirit in the righteous man who is broken in body, seeing that he is tormented by his sufferings? And further, do we not know of many righteous men, beloved by the Almighty, who were never a prey to acute suffering or physical weakness? Why this discrimination? Why should these be physical wrecks and the others hale and hearty? One explanation given is that the latter were born of righteous parents, whereas the former, although themselves righteous, were not children of righteous parents. But the facts are against this, since we see many righteous men who are the sons of righteous parents, and who nevertheless are afflicted with bodily ills and are lifelong sufferers. But there is a deep mystery involved here, inasmuch as all the ways of God are based on truth and righteousness. In connection with this verse I have found in the books of the ancients a mystical doctrine, and next to it another mystical doctrine, both being in essence one and the same. It amounts to the following. There is a period when the moon is defective, judgement being visited upon her, and the sun being concealed from her. Now it is the moon that at all times and seasons releases souls to enter the sons of men-she having previously gathered them for the purpose. Of those souls, then, which she releases during the period that she is under sentence, every one will always be the victim of degradation and poverty and suffer other chastisements, irrespective of whether he be sinful or righteous. (Prayer, however, can avert any sentence of punishment.) But those souls which the moon sends forth when she is in the grade of completeness, and the perennially flowing stream plays about her, are destined to enjoy abundance of all good things-of riches, children, and bodily health-and all on account of the mazzal that flowed forth and joined itself to that grade in order to be perfected and blessed by it. We see thus that all things are dependent on mazzal, according to the dictum: Children, life, and livelihood do not depend on a man's merits, but on mazzal. Hence all those who are sorely afflicted in this world in spite of being truly righteous suffer through the mischance of their soul; but in compensation G-d has compassion on them in the world to come.’