There shall always be much silence in a man's conduct. He shall speak only about a matter concerned with wisdom or matters that are necessary to keep… - Moshe ben Maimon

The third class of evils comprise those which everyone causes to himself by his own action. This is the largest class, and is far more numerous than the second class. It is especially of these evils that all men complain,—only few men are found that do not sin against themselves by this kind of evil. ...This class of evil originates in man's vices, such as excessive desire for eating, drinking, and love; indulgence in these things in undue measure, or in improper manner, or partaking of bad food. This course brings diseases and afflictions upon the body and soul alike.

No form remains permanently in a substance; a constant change takes place, one form is taken off and another is put on.

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.