"The first time I came to Kotzk, and I saw the Rebbe in his study, it seemed to me that the Mishnaic sage Akavia ben Mahalalel stood opposite me, thundering: 'Know from where you came! Know where you are going to! Know before Whom you will give justification and a reckoning!' (Pirkei Avot 3:1). This vision remained engraved in my heart all my life, and when I returned home after eight weeks in Kotzk, all desires and empty pleasures were contemptible in my eyes."
Meir Urian, Sneh Boer BeKotzk, p. 88