You will certainly not doubt the necessity of studying astronomy and physics, if you are desirous of comprehending the relation between the world and Providence as it is in reality, and not according to imagination.
MaimonidesThe more we desire for that which is superfluous, the more we meet with difficulties; our strength and possessions are spent in unnecessary things, and are wanting when required for that which is necessary.
MaimonidesTo the totality of purposes of the perfect Law there belong the abandonment, depreciation, and restraint of desires in so far as possible.
MaimonidesWe suffer from the evils which we, by our own free will, inflict on ourselves and ascribe them to God, who is far from being connected with them!
MaimonidesThe 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.
Maimonides