Likutay Moharan - Volume 2 - Torah-teaching 104

He Greatly Loved Simple Services

He greatly loved the simple services of ordinary upright people, and he greatly loved one who could say many supplications and requests within the large prayer books, as is the way of the upright masses. And he cautioned and rebuked us several times to sing songs on Shabbos, and he was very particular and angry at one who is wise in his own eyes and does not exert himself to sing songs on Shabbos and on Motzaei Shabbos or other simple services. For the essence of Judaism is in simplicity and complete sincerity without any sophistries, as explained by us already several times. And also he himself, of blessed memory, before the severe illness that caused his passing, before this, all his days he would sing many songs every Shabbos and Shabbos and on Motzaei Shabbos.