Job 29:24

“[If] I laughed on them, they believed [it] not, etc.] Not that he at any time laughed at them, by way of derision; but when in a cheerful frame of mind, or in a merry mood, he used freedom and familiarity, and jested with them; but they could not believe that he did jest, or was in jest, he being a man always of such gravity and seriousness, that they concluded the smile on his countenance, and the pleasant turn of his expression, had a serious meaning in them; or such familiarity with them was so pleasing to them, that they could scarcely for joy believe that he did condescend to indulge such an air of pleasantry: or as Mr. Broughton renders it, and so some others to the same sense, “they…”

“When I relaxed from my wonted gravity (a virtue much esteemed in the East) and smiled, they could hardly credit it; and yet, notwithstanding my condescension, they did not cast aside reverence for my gravity. But the parallelism is better in UMBREIT'S translation, "I smiled kindly on those who trusted not," that is, in times of danger I cheered those in despondency. And they could not cast down (by their despondency) my serenity of countenance (flowing from trust in God) (Pro 16:15; Psa 104:15). The opposite phrase (Gen 4:5-6). "Gravity" cannot well be meant by "light of countenance."”

“If I laughed on them they believed it not - There is considerable variety in the interpretation of this member of the verse. Dr. Good renders it, “I smiled upon them, and they were gay.” Herder, If I laughed at them, they were not offended.” Coverdale,” When I laughed, they knew well it was not earnest.” Schultens, “I will laugh at them, they are not secure.” But Rosenmuller, Jun. et Trem., Noyes and Umbreit, accord with the sense given in our common translation. The Hebrew literally is, “Should I laugh upon them, they did not confide;” and, according to Rosenmuller, the meaning is, “Such was the reverence for my gravity, that if at any time I relaxed in my severity of manner, they would…”

“Laughed - Carried myself so familiarly with them, that they could scarce believe their eyes and ears. Cast not down - They were cautious not to give me any occasion to change my countenance towards them. Job 29:25”

“they believed: Gen 45:26; Psa 126:1; Luk 24:41 the light: Psa 4:6, Psa 89:15 Job 29:25”