Kohelet Rabbah 4.16

אֵין קֵץ לְכָל הָעָם לְכֹל אֲשֶׁר הָיָה לִפְנֵיהֶם, אֵין קֵץ לְכָל הַדּוֹרוֹת שֶׁאִבֵּד יֵצֶר הָרָע. גַּם הָאַחֲרוֹנִים לֹא יִשְׂמְחוּ בוֹ, שֶׁנִּשְׁמָעִין לוֹ.

“There is no end to all the people, to all who were before them; the latter ones, too, will not rejoice in him, as this too is vanity and herding wind” (Ecclesiastes 4:16). “There is no end to all the people, to all who were before them” – there is no end to all the generations that were eliminated by the evil inclination. “The latter ones, too, will not rejoice in him” – because they heed it.