Siman 164

(14.) On Sukkos 5568 [1807/8] — at the time the cough illness was beginning for him, before he traveled to Lemberg — it was heard from his holy mouth on the first night of Sukkos that he asked what the word "hust" is in a foreign language. And at first they did not understand his intent. And afterwards he spoke of this — that in their language a guest [ushpiza] is called hust. And he did not speak further on this matter — but he then mentioned the saying of our Rabbis of blessed memory that they were accustomed to speak in the language of wisdom, as our Rabbis of blessed memory said [Eruvin 54a]: "Rabbi Avahu when he would speak in the language of wisdom..." and the like. And it appeared that he was hinting in his holy conversation to the matter of the holy ushpizin [supernal guests] who enter the sukkah. And none of us knew to what extent. For this is already known to us and is a great principle: that in all things of the world and in all the languages of the nations one can find G-dliness, as is explained from his words in his books several times. And it is as he brings the teaching of our Rabbis of blessed memory [Jerusalem Talmud, Ta'anis]: "Tat in Kaspai [means] two, pat in Africa [means] two" etc. And the immensity of the greatness of Rabbainu z"l's attainment in this matter — it is impossible to estimate or tell — even of what we merited to see and understand with our own minds. For we saw with literal physical experience that before him the entire world was open and revealed, and he would see in everything the clothing of the vitality of G-d, to the point that he could make wondrous and awesome Torahs from all things in the world. And it is impossible to elaborate or tell of this to one who did not merit to see it with his own eyes. And if you merit to walk on the straight and true path, and merit to delve deeply into the books of Rabbainu z"l, you will merit to understand something of this.