Teach thy tongue to say I do not know, and thou shalt progress. - Moshe ben Maimon

He who thinks he can have flesh and bones without being subject to any external influence, or any accidents of matter, unconsciously wishes to reconcile two opposites, viz., to be at the same time subject and not subject to change. If man were never subject to change there could be no generation; there would be one single being, but no individuals forming a species.

All the great evils which men cause to each other because of certain intentions, desires, opinions, or religious principles, are likewise due to non-existence, because they originate in ignorance, which is absence of wisdom.

Every Israelite has a duty to study whether he is poor or rich, whether healthy or suffering, whether young or very old and in failing strength, even if he is poor and supported by charity or begs from door to door.