What does "holy" actually mean, if it is not just "religious"?
The prayer says it in one breath: You are holy, and Your Name is holy. It never says what holy means. The verse that tells us to be holy like God (Vayikra 19:2) does not stop to define the word.
One explanation is in the Sifra (an early collection of rabbinic teachings on the book of Vayikra). On this verse it says only: be holy means be parush. On a similar verse earlier in Vayikra (11:44), it spells it out: just as I am holy, so you be holy. Just as I am parush, so you be parush. Parush means set apart, held back. In this reading, holy means in a class of its own, and for people it means holding yourself back.
Rashi (the main medieval commentator on the Torah) reads the verse more narrowly. For him it means staying away from forbidden sexual relationships and from sin. He notices that wherever the Torah fences off a forbidden relationship, it also uses the word holiness.
The Ramban (Nachmanides, a medieval Torah commentator from the 1200s) reads it differently. He says this holding back is not about forbidden relationships, since the Torah already forbids those. A person could break nothing the Torah forbids, and still overeat, drink too much, and talk in a crude way. He would be, in the Ramban's words, a scoundrel with the Torah's permission. So the command to be holy asks you to hold back even from some things that are allowed.
None of this sounds warm. But the prophet Yeshayahu (Isaiah) uses the same word for God: "the high and lifted-up One, who lives forever, whose name is holy." The verse keeps going: "I live in a high and holy place, and also with the crushed and the low in spirit" (Yeshayahu 57:15).
So the sources give two pictures at once. Holy means set apart, one of a kind. And the same verse that says it puts God close to people who feel small. The sources do not try to remove that tension.
Vayikra 19:2,Sifra, Kedoshim 1:1,Sifra, Shemini, chapter 12,Rashi on Vayikra 19:2,Ramban on Vayikra 19:2,Yeshayahu 57:15Why would God need me to praise Him? Doesn't that sound insecure?
The line says holy ones praise God every day. A fair question: why would a God who needs nothing want praise at all?
The Yerushalmi (the Gemara of the Land of Israel) records Hillel the Elder, a great teacher from about 2,000 years ago, asking the same thing. When he saw people acting carelessly, he said: does God need their praise? Thousands upon thousands already serve Him (Daniel 7:10). When he saw them doing it properly, he said the opposite. Even with all that praise before Him, the praise of Israel is dearer to Him than any of it.
The Yerushalmi backs this with two verses about the songs and praises of Israel. The second comes from a verse that begins with the same words as our prayer: "And You are holy, enthroned on the praises of Israel" (Tehillim 22:4).
The Midrash on Tehillim (a collection of rabbinic teachings on that book) reads the verse this way: every time Israel praises God, His glory sits among them. The word for enthroned, yoshev, also means sits. The same Midrash adds that God is also above every praise, as Nechemiah 9:5 says, "exalted above every blessing and praise."
Abudarham says that in our line, the holy ones who praise God every day are Israel. Avot DeRabbi Natan (an early collection of rabbinic teachings that grew out of Pirkei Avot, the Mishnah's book of sayings) sets the song of the angels beside the song of Israel and says Israel's praise is the better one.
None of this says God is missing something. The picture is closer to this: God does not need praise, and still sits inside it. Hillel is recorded saying both. These are answers from the sources, not the only possible answers.
Talmud Yerushalmi, Sukkah 5:4,Midrash Tehillim 22:13,Avot DeRabbi Natan, version B, 44:16,Abudarham, Weekday Prayers, AmidahWhy does one wrong word in the Ten Days mean starting the Amidah over?
In the Ten Days of Repentance, from Rosh Hashanah to Yom Kippur, this blessing ends differently. All year it ends "the holy God." In these days it ends "the holy King." If you say the usual ending out of habit, the Shulchan Aruch rules that you go back to the beginning of the Amidah (Orach Chaim 582:1). The printed instruction in our siddur adds that if you catch it right away and fix it, you can keep going.
That seems like a lot for one word, and the Gemara knew it. Rabbi Elazar said the old ending still counts (Berakhot 12b). The ruling went with Rabba, who said the change is required.
Tosafot (a medieval commentary on the Gemara by French and German scholars) gives the reason in one line: anyone who changes the form the Sages fixed has not done what he owes. The Hebrew word for form is the word for a minted coin. A coin has a fixed design. In this view, a blessing has a fixed form too.
Why go back to the beginning, and not just redo this blessing? The Mishnah Berurah (a central commentary on daily Jewish law, written around 1900) answers in a few words: the first three blessings of the Amidah count as one (582:4). So a mistake in the third one sends you to the start of the first. In another place he explains what the three have in common: they are all praise, like a servant setting out praise before his master, so personal requests do not belong in them (112:1).
The reasons given are about what counts as having said the blessing the Sages set. They are not about punishment.
Shulchan Aruch, Orach Chaim 582:1,Berakhot 12b,Tosafot on Berakhot 12b,Mishnah Berurah 112:1 and 582:4