Quotation על אבות 5:1

However, the matter is as they stated, may their memory be for blessing: "With Ten Utterances was the world created and they are juxtaposed to the Ten Commandments, as out Sages of blessed memory stated, that He looked into the Torah and created the world. For the matter of the creation of the world is known to have begun from a state wherein He and His Name were in one simple unity without any perceptibility, comprehension or bounds whatsoever, for it is infinite. And when it arose in His simple will create, He constricted Himself, as is known. Now the matter of simple unity and infinity is the utterance "I am" and all the [corresponding] positive Commandments, the constriction (TzimTzum), which is limitation (Gevurah), and the [corresponding] utterance "You shall not have" along with all the details are the negative Commandments which [when taken together] is the entirety of the Torah through cause and effect to each and every detail. And all of the roots and branches in general and her details, which have their source above, manifest [into] fruits below in the form of the performance of the Commandments, which is our holy Torah with all of her Commandments, Decrees and Laws.