It sanctifies the seasons, and regulates your history, both in the past and in the future. Above all, it teaches that disobedience is the strength of sin. It insists upon the observance of both the spirit and of the letter; spirit without letter belongs to the species known to the mystics as "nude souls" (nishmatim artilain), wandering about in the universe without balance and without consistency...In a word, Judaism is absolutely incompatible with the abandonment of the Torah."