תַּ֗חַת אֲשֶׁ֤ר לֹא־עָבַ֙דְתָּ֙ אֶת־יְהוָ֣ה אֱלֹהֶ֔יךָ בְּשִׂמְחָ֖ה וּבְט֣וּב לֵבָ֑ב מֵרֹ֖ב כֹּֽל׃
Et parce que tu n’auras pas servi l’Éternel, ton Dieu, avec joie et contentement de cœur, au sein de l’abondance,
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.