Jews do not proselytize

Isaiah (Yeshayahu) 42:2:

"[Jacob/Israel] will not cry out nor lift [his voice], nor will he make his voice heard outside."

Rashi: "He will not need to reprove or prophesy to the nations, for they themselves will come to learn from them (the Jews), as it says: 'Let us go with you for we have heard that G-d is with you' (Zachariah 8:23)."

Liturgical poems (piyutim), halachic rulings from heaven

Shulchan Aruch, Orach Chayim 112:2:

"One should not recite liturgical poems during [the shemoneh esreh] prayer."

Mishnah Berurah, ad loc:

"In the responsum of Radvaz, v. III, responsum 532, [Radvaz] wrote at length to permit this (and he wrote that he has in his hand some inquiries that one of the rishonim asked of heaven via meditative seclusion (hithbodeduth) and prayer and invocation of names, and they responded to his inquiries, and he asked also about this [matter of liturgical poems] and they answered him that it is permitted). See there that [Radvaz] cautions strongly not to alter the [accepted] custom [to recite them]."

Of Songs and Shepherds

Rabbi Nachman of Breslov writes that the origin of music is the earth. Each blade of grass, he writes, plays a particular note, and somehow, the shepherd, who dwells in the fields as his sheep graze, subconsciously absorbs these notes and plays a unique tune, based on the notes of the grass of the area that he inhabits at any particular time.

Since discovering this idea, I "noted" the relationship between many words relating to plants and music. Some examples:

GaN = garden; niGuN = melody

ZeMuRah = vine; ZeMiRah = pruning, song

ShaRon = lush pasture (Metzudath Tziyon, Isaiah 35:2); ShiR = song