It is forbidden to dwell in the vicinity of any of those with an evil tongue, and all the more to sit with them and listen to their words. - Moshe ben Maimon

A man shall not be full of laughter and mockery, nor sad and mournful, but joyful. ... His desire shall not be so great that he rushes for wealth, nor shall he be lazy and refrain from working. But he shall live in contentment, have a modest occupation, and be occupied mainly with the Torah.

The portion of the materia prima which is... is endowed with the intellectual faculty, possesses a special property by which each individual, according to the degree of his perfection, is enabled to manage, to calculate, and to discover what is conducive both to the temporary existence of the individual and to the preservation of the species. All other movements... by the individual members of the species are due to accident; they are not, according to Aristotle, the result of rule and management... Aristotle sees no difference between the falling of a leaf or a stone and the death of the good and noble people in the ship; nor does he distinguish between the destruction of a multitude of ants by an ox depositing on them his excrement and the death of worshippers killed by the fall of the house when its foundations give way.

No disease that can be treated by diet should be treated with any other means.