Tanakh para sa Mga Kawikaan 31:2

And more than they [("righteous writ” 12:10)], my son, take heed [to heed the words of the sages. And if you ask: If there is need of them, why were they not written down?] In the making of books there is no end [and if we began, we could never finish.]; and overmuch thought [i.e., attempts to digest more than we can understand] is a weariness of the flesh.