תַּ֗חַת אֲשֶׁ֤ר לֹא־עָבַ֙דְתָּ֙ אֶת־יְהוָ֣ה אֱלֹהֶ֔יךָ בְּשִׂמְחָ֖ה וּבְט֣וּב לֵבָ֑ב מֵרֹ֖ב כֹּֽל׃
네가 모든 것이 풍족하여도 기쁨과 즐거운 마음으로 네 하나님 여호와를 섬기지 아니함을 인하여
Sha'arei Kedusha
The opposite is true when one serves HaShem-יהו״ה, blessed is He, with joy, as it states,418Psalms 100:2 “Serve HaShem-יהו״ה with joy.” For joy increases one’s desire and love of adhering to HaShem-יהו״ה, blessed is He, as written,419Deuteronomy 28:47 “Because you did not serve HaShem-יהו״ה your God with joy and gladness of heart etc.” For, a person who serves HaShem-יהו״ה, blessed is He, with melancholy, is likened to a servant who serves his master with a sullen and annoyed face.