Likutei Halakhot, Orach Chaim, Laws of Thanksgiving Blessings 1:1/ליקוטי הלכות·אורח חיים·הלכות ברכת הודאה א׳:א׳

1"There are four categories of people who are obligated give thanks... and the mnemonic is Vekhol haChaYIM yodukha Selah" [a phrase in the third blessing in the `Amidah]: Choleh/sick, Yesurin/imprisoned, Yam/sea, Midbar/wilderness. What is the blessing he says? "Blessed are You Hashem Who bestows good things upon those who are owing/guilty" [Shulchan Aruch Orach Chayim Siman 219].

22. In accord with the lesson on Chanukah LM II #2: there he explains that via acknowledging thanks, the aspect of four [categories of people] need to recite the thanksgiving prayer, which is the aspect of the bliss of the Coming World, which then will be days of thanksgiving to H"Y, the aspect of halakhoth/Torah way, as explained there. Thereby the truth will shine, through three names, which are the aspect of Torah, Prayer, and Matchmaking and Matrimony into speech. Namely to complete the four facets of speech, the four divisions of speech, which are [1] penitent speech, [2] charitous speech, [3] the speech of the rich who are close to Malkhuth — the aspect of the "hasheloshah serigim/three branches" [Gen. 40:10] etc., and [4] the aspect of Malkhuth, the mouth etc.; see there. And thereby the sanctity of Shabbath is drawn to the six mundane days. And thereby all the various actions/events are drawn into the Simple Unity etc.; see there. Which, this is the aspect of "Halakhah kerabim/The law follows the majority;" take a good look there regarding all this.

33. So now we can say that this itself is the aspect of "Four categories have to give acknowledgement," for, corresponding to the four parts of speech that are perfected by them, specifically by thanksgiving, namely through the four who have to give thanks, through them the fourfoldness of speech is made whole, as mentioned. And that is why there are four who have to give thanks, corresponding to the four parts of speech that are made whole through them: [1 Choleh] For, one who was ill and got well and acknowledges it to H"Y, this is the aspect of teshuvah, for, "A person does not get up from his sickness unless they forgive him all his transgressions," namely through teshuvah, as written, "Veshav verafe lo/and he return and he gets healed" [Isa. 6:10]. [2 Yam] Those who go down to the sea, this is the aspect of speech of charity, as brought in Yonah, regarding the people that were with him on the ship, who swore an oath, for tzedakah is the aspect of the sea, the aspect of water, as written, "and righteousness as a mighty stream" [Amos 5:24], the aspect of "Shelach lachmekha `al penei hamayim/Cast your bread on the face of the water" [Eccl. 11:1]. [3 Yesurin] One who was locked in prison who goes out from captivity, this is the aspect of the wealthy who are close to Malkhuth [Rashi on Chullin 92a], that through them is the path whereby the captive goes out from imprisonment, the aspect of the "Shelosheth haserigim/the three branches," "hasheloshah sarei ge'im/the three high noblemen" [Chullin 92a] by whom Yosef went out from prison, as explained in Torah. [4 Midbar] Wilderness, this is the aspect of the essence of speech, the aspect of Malkhuth-mouth, because wilderness alludes to speech itself, as explained in the holy Zohar. For, wilderness is the aspect of speech, that is, the aspect of Malkhuth-mouth, which is the essence of speech.