Proverbs 15:2
Context15:2 The tongue of the wise 1 treats knowledge correctly, 2
but the mouth of the fool spouts out 3 folly.
Proverbs 15:13
Context15:13 A joyful heart 4 makes the face cheerful, 5
but by a painful heart the spirit is broken.
Proverbs 17:22
Context

[15:2] 1 sn The contrast is between the “tongue of the wise” and the “mouth of the fool.” Both expressions are metonymies of cause; the subject matter is what they say. How wise people are can be determined from what they say.
[15:2] 2 tn Or “makes knowledge acceptable” (so NASB). The verb תֵּיטִיב (tetiv, Hiphil imperfect of יָטַב [yatav, “to be good”]) can be translated “to make good” or “to treat in a good [or, excellent] way” (C. H. Toy, Proverbs [ICC], 303). M. Dahood, however, suggests emending the text to תֵּיטִיף (tetif) which is a cognate of נָטַף (nataf, “drip”), and translates “tongues of the sages drip with knowledge” (Proverbs and Northwest Semitic Philology, 32-33). But this change is gratuitous and unnecessary.
[15:2] 3 sn The Hiphil verb יַבִּיעַ (yabia’) means “to pour out; to emit; to cause to bubble; to belch forth.” The fool bursts out with reckless utterances (cf. TEV “spout nonsense”).
[15:13] 4 tn The contrast in this proverb is between the “joyful heart” (Heb “a heart of joy,” using an attributive genitive) and the “painful heart” (Heb “pain of the heart,” using a genitive of specification).
[15:13] 5 sn The verb יֵיטִב (yetiv) normally means “to make good,” but here “to make the face good,” that is, there is a healthy, favorable, uplifted expression. The antithesis is the pained heart that crushes the spirit. C. H. Toy observes that a broken spirit is expressed by a sad face, while a cheerful face shows a courageous spirit (Proverbs [ICC], 308).
[17:22] 7 sn Heb “a heart of rejoicing”; KJV “a merry heart”; NAB, NASB “a joyful heart.” This attributive genitive refers to the mind or psyche. A happy and healthy outlook on life brings healing.
[17:22] 8 tc The word “healing” is a hapax legomenon; some have suggested changes, such as to Arabic jihatu (“face”) or to גְּוִיָּה (gÿviah, “body”) as in the Syriac and Tg. Prov 17:22, but the MT makes sense as it is and should be retained.
[17:22] 9 sn The “crushed spirit” refers to one who is depressed (cf. NAB “a depressed spirit”). “Crushed” is figurative (an implied comparison) for the idea that one’s psyche or will to go on is beaten down by circumstances.
[17:22] 10 sn The “bones” figuratively represent the whole body encased in a boney framework (metonymy of subject). “Fat bones” in scripture means a healthy body (3:8; 15:30; 16:24), but “dried up” bones signify unhealthiness and lifelessness (cf. Ezek 37:1-4).