Siman 580

(137.) Said the transcriber: I also heard from one person who was told by the man who was serving the aforementioned Rabbi Tzvi Aryeh — that when Rabbi Tzvi Aryeh returned home from the journey to the aforementioned forest, he said then: "I had seen him [meaning Rabbainu o.b.m.] some years ago when he was at my home — and even then I had no understanding of him at all. But now I do not know at all." [in Yiddish: "nor haynt veis ich shoin gor nisht"]. And as it appears, one must understand...