John Trapp on Job 8:21

Verſe 21. Till he fill thy mouth with laughing &c.] Here he applies the promiſe of the divine help to Job, and that which is here ſpoken, debent & reliqu[illegible: 1 letter] fideles ad ſe transferre, ſaith Lavater, every true believer muſt take home to himſelf: God will turn all their ſadneſſe into gladneſſe, all their ſighing into ſinging, all their tears into triumphs, their ſorrowful out-cryes into joyful jubilees. In the tranſgreſſion of an evil man there is a ſnare or a cord, viz. to ſtrangle his joy with, to check and choak all his comforts; but the righteous ſing and rejoyce Prov. 29.6. They may do ſo here amidſt all their troubles, 2 Cor. 7.4. As the Lily looks freſh and beautiful, and blithe, though among thorns: they ſhall do ſo hereafter, when they enter into the joy of their maſter. See Iſa. 65.13. A joy fitter to be believed, then poſſible to be diſcourſed. See a ſhadow of it, Pſalm 126.1, 2.