Maybe with some Tzaddikim we have to give a long introduction as to who they are and what they have accomplished but with the Bobov Rebbe, you simply have to glance at his face and you just know. I once had the honor of attending one of his Tishes. At the time I knew the Rebbe was already very old and weak. My heart took shock at the tremmendous energy and love the Rebbe had. To hear him sing in front of hundreds. I was the one who felt I was over the hill.