For there is no enchantment in Jacob, nor divination in Israel (23:23)
On the occasion of his bar-mitzvah, Rabbi Sholom DovBer of Lubavitch was told by his father:
"Rabbi DovBer, the Maggid of Mezeritch, bequeathed a smile to Rabbi Schneur Zalman of Liadi. With this smile he could have won over the world.
"But the entire life's work of Rabbi Schneur Zalman was to implant an inner integrity ('p'nimius') within his chassidim. So he made his case with the 'internal' mediums of intellect and feeling, and shunned the use of anything associated with the 'peripheral' attributes of the soul."
With all due apologies, I'm not sure I get the point. Why reject such a legacy from a great Torah scholar and inspired Jewish leader? Why shun a smile that could have won over the world as something "associated with the 'peripheral' attributes of the soul." By contrast, see Shammai in Pirke Avos (1:15): "Make your Torah study a permanent fixture of your life. Say little and do much. And receive every man with a pleasant countenance."