Teach thy tongue to say 'I do not know,' and thou shalt progress.

Do not imagine that these most difficult problems can be thoroughly understood by any one of us.

While one man can discover a certain thing by himself, another is never able to understand it, even if taught by means of all possible expressions and metaphors, and during a long period; his mind can in no way grasp it, his capacity is insufficient for it.

For every force charged by God, may He be exalted, with some business is an angel put in charge.

Astrology is not an art, it is a disease.

Be convinced that, if man were able to reach the end without preparatory studies, such studies would not be preparatory but tiresome and utterly superfluous.

For it is said, "You shall strengthen the stranger and the dweller in your midst and live with him," that is to say, strengthen him until he needs no longer fall upon the mercy of the community or be in need.