Tosefta к Мишлей 3:18

...Another interpretation (Ecclesiastes 12:11) "The sayings of the wise are like goads, like nails fixed in prodding sticks. They were given by one Shepherd." Just as the goad directs the cow so as to bring life to the world, so too words of Torah are only life for the world, as it is said, “It is a tree of life . . .” [Proverbs 3:18]. Or, just as the goad is movable, might it be so for words of Torah? Scripture says, “And like nails firmly planted.” [Or, might (words of Torah like nails) neither diminish nor increase? Scripture says, “firmly planted.”] Just as a plant flourishes and grows, so too words of Torah flourish and grow. 'Masters of Assemblies' these are students of the wise that enter into multiple assemblies and declare what is impure [to be] impure, and what is pure [to be] pure; what is impure [to be] in its place and what is pure [to be] in its place. Perhaps it will arise in one's mind that since Beit Shammai [declares] impure and Beit Hillel [declares] pure, so-and-so prohibits and so-and-so permits, [Why] should I henceforth study Torah? Scripture teaches "words" "the words" "these are the words" [see Exodus 19:6-7] all of these words were given by "one Shepherd" [Ecclesiastes 12:11]. One God created them, one Benefactor gave them, the Master of all deeds, blessed be He, said them. Now make for your heart chambers within chambers and bring into it the words of Beit Shammai and the words of Beit Hillel, the words of those who declare impure and the words of those who declare pure.