The psalm says armies can't save a king. So why fight at all?
Verses 16 and 17 sound like a warning about armies. "A king is not saved by a great army. A warrior is not rescued by great strength. The horse is a false hope for rescue." On Chanukah that raises a fair question. The Hasmoneans (the priestly family also known as the Maccabees) went to war. Was that a mistake?
Radak (Rabbi David Kimchi, a Torah commentator in southern France around 1200) says what the verse is for. It is so people will see that God watches over them. At times, he says, a king with a big army falls to a small nation. He gives examples. The king of Assyria came to Jerusalem with a huge force, and in the morning his soldiers were all dead. And Goliath, a mighty warrior, fell to David, who was only a young man. Radak sums it up: neither strength nor an army helps a person unless God wants it.
Notice what Radak does not say. He does not say anyone should have stayed home. In his own example, Goliath fell into David's hand.
The Mishnah makes a similar point about the war against Amalek. Moshe held up his hands while Israel fought. The Mishnah asks: do Moshe's hands make war or break war? No. When Israel looked upward and gave their hearts to their Father in heaven, they won. If not, they fell.
The Rambam (Maimonides, the great medieval codifier of Jewish law, who died in 1204) describes the Chanukah war like this: God had mercy on Israel and saved them, and the Hasmonean high priests overcame the enemy, killed them and saved Israel. The prayer Al HaNissim says it in one line: You handed the strong over to the weak, and the many to the few.
So the sources agree on something narrow. The Hasmoneans did fight, and the sources credit God for the result. Where the line falls between doing your part and counting on God, they do not say.
Tehillim 33:16-17,Radak on Tehillim 33:16,Mishnah Rosh Hashanah 3:8,Rambam, Laws of Megillah and Chanukah 3:1,Al HaNissim, in the AmidahGod "watches over" people who trust Him. So why do good people suffer?
Verses 18 and 19 say: "The eye of Hashem is on those who fear Him, who wait for His kindness, to rescue their lives from death and to keep them alive in famine." Read fast, it sounds like a promise that good people are safe. Most people have seen that life does not always work that way.
Look at the last words: "in famine," not "from famine." Radak reads it this way. If famine comes to the world, God keeps these people alive, and arranges ways to feed them among the hungry. The famine still comes.
The Midrash Bereishit Rabbah (an early Midrash on Bereishit) reads these verses as the story of Avraham. "From death" is his rescue from Nimrod. "In famine" is the famine of Bereishit 12:10, which is why he went down to Egypt. So the rescue came inside a hard time, not instead of one.
The Gemara knows the question is hard. In Berakhot 7a, Moshe asks God directly why one righteous person does well and another suffers. One answer given there is that a righteous person who suffers is not completely righteous. That is a hard answer to hear. Then the Gemara records a disagreement: Rabbi Meir says Moshe was not given this answer at all. God told him only that He is kind to whom He is kind, even to someone who is not worthy.
So there is no single clean answer here. The psalm says what God does for people who trust Him. The Midrash shows it in one man's life. And the Gemara says openly that how God runs the world was not fully explained, even to Moshe, according to Rabbi Meir.
Tehillim 33:18-19,Radak on Tehillim 33:19,Bereishit Rabbah 40:1,Berakhot 7aWhy sing a "new song" when the siddur has the same words every day?
Verse 3 says: "Sing to Him a new song." But when you say this psalm, you read words that have been said for a long time, from a printed page. So what is new?
Radak (Rabbi David Kimchi, the commentator from southern France) reads the command as a habit. He explains it as: renew a song for Him always. So the point is not one new song. It is that the song keeps being renewed.
Malbim (Rabbi Meir Leibush Malbim, a Torah commentator in Eastern Europe who died in 1879) gives a reason. God does not run the world only by fixed laws of nature. He also responds to what people do, so new things keep happening, good or bad. The song is renewed along with the events.
The Midrash Tehillim hears "new" differently. The song is for the One who did something new: He left the heavens and made His presence dwell on earth, as it says, "Make Me a Sanctuary."
The Gemara in Arakhin uses this verse another way. Rabbi Yehuda says the Temple harp had seven strings, the harp of the days of the Messiah will have eight, and the harp of the World-to-Come will have ten. For ten he cites Tehillim 92, and then this verse, which mentions a ten-stringed instrument and a new song.
Two other Gemaras have an idea close to Malbim's, though neither quotes this verse. In Pesachim 117a, the Sages say the Prophets set up Hallel (the psalms of praise) to be said for every trouble, and when Israel is rescued, for that rescue. Shabbat 21b says that for Chanukah the sages made the days holidays with Hallel and thanks. New rescue, new praise.
These readings do not agree, and none of them says how a fixed prayerbook fits "new." That part is left to you.
Tehillim 33:3,Radak on Tehillim 33:3,Malbim on Tehillim 33:3,Midrash Tehillim 33:1,Arakhin 13b,Pesachim 117a,Shabbat 21b