וַיֹּ֤אמֶר לּוֹ֙ מַלְאַ֣ךְ יְהוָ֔ה לָ֥מָּה זֶּ֖ה תִּשְׁאַ֣ל לִשְׁמִ֑י וְהוּא־פֶ֛לִאי׃ (ס)
At sinabi sa kanya ng anghel ng Walang-Hanggan: “Bakit mo pa itinatanong ang aking pangalan, gayong ito ay lihim?”
Rashi
When it is mystical. It is concealed. It changes constantly,4According to the angel’s mission at that particular time. Cf. Rashi to Bereishis, 32:30. so that its identity remains unknown on any given day.