You must know that if a person, who has attained a certain degree of perfection, wishes to impart to others, either orally or in writing, any portion… - Moshe ben Maimon

Maimonides therefore undertook to compile a complete code, which would contain, in the language and style of the Mishnah, and without discussion, the whole of the Written and the Oral Law, all the precepts recorded in the Talmud, Sifra, Sifre and Tosefta, and the decisions of the Geonim.

If the whole earth is infinitely small in comparison with the sphere of the stars, what is man compared with all these created beings? How, then, could any one of us imagine that these things exist for his sake and benefit, and that they are his tools! This is a result of an examination of the corporeal beings: how much more so will be the result of an examination of the Intelligences!

The most evident of the wonders described in the book On the Use of the Limbs [by Galen]... is clearly perceived by all who examine them with a sharp eye. In a similar manner did God provide for each individual animal of the class of mammalia. When such an animal is born it is extremely tender, and cannot be fed with dry food. Therefore breasts were provided which yield milk, and the young can be fed with moist food which corresponds to the condition of the limbs of the animal, until the latter have gradually become dry and hard. Many precepts in our Law are the result of a similar course adopted by the same Supreme Being. It is, namely, impossible to go suddenly from one extreme to the other; it is therefore according to the nature of man impossible for him suddenly to discontinue everything to which he has been accustomed.