Hayom Yom: Menachem Av 16

The travels of the Baal Shem Tov when he first revealed himself were for three purposes: Redemption of captives, buttressing Torah and piety, and revealing the Inner Torah (Chassidus).

The Mitteler Rebbe would explain: The Revealed Torah1 is called water; one goes to water. The Inner Torah is called fire; one fears fire. Therefore, the mashpiya (the one who gives to another)2 must go to the recipient and say to him, "Do not fear, for Hashem your G-d is a consuming fire."3