"Nine Moses' cannot make a minyan to say a kedusha, though that would be a tremendous amount of quality; but if you have ten in quantity [regardless of their stature], you can say kedusha, just as the Midrash Rabba stated that 600,000 were necessary for the Revelation at Sinai. This indicates that quantity transforms into quality."
The Rebbe - meeting with Hillel Directors, August 1959
Moses prostrated himself and kissed Yisro: Moses embodied Divine wisdom, whereas Yisro embodied natural, worldly wisdom. By bowing down to Yisro, Moses elevated natural wisdom and accepted it into the sphere of Divine wisdom. This, as we have seen, was a prerequisite to the Giving of the Torah.
