It has been suggested that although old rabbinic literature always mentions dozens of teachers who speak be-shem omro (i.e., "in the name of him who says"), the Apostle Paul does not refer to contemporary (or nearly contemporary) Jewish scholars in a single one of his letters or in any of his sermons recorded in Acts by Luke. The other apostles also eschewed the expression in their writings.
My question, then, rather than being instigated by a particular problematic verse or passage from the Bible, is instigated by the lack of any verses or passages in the apostles' writings which cite influential Jewish scholars, such as Rabbi Hillel The Elder, who lived and taught within a generation or two (possibly three, depending on how one determines a generation) of the apostles, particularly Paul.
Since Paul was schooled at the feet of Gamliel The Elder, the first to be called "Rabban" and the first president of the Great Council in Jerusalem (see Acts 5:34-40), I find it curious he did not quote his mentor. True, Paul quoted and/or alluded to some "secular" writers, but the vast majority of his citations were almost always to the Tanakh or occasionally to the words of Jesus (e.g., Acts 20:35 and 1 Corinthians 11:23--"For I received from the Lord . . .").
While any answer will involve an argument based on silence, I suggest silence can be, perhaps, an important hermeneutical principle, at least macroscopically. In other words, if a writer in any generation eschews in his or her writing a common, virtually ubiquitous locution used by his or her peers/contemporaries, an inquisitive observer just might want to know why. I know I do.