Letter to Elizabeth Hoar
p54“Sunday is my only day of peace, and how often, as in Providence, have I blest again and again the "sweet day of sacred rest.”
Fuller, Margaret. The Letters of Margaret Fuller. Edited by Robert N. Hudspeth. Vol. III. Ithaca: Cornell University Press, 1986.
Inferred Fuller places "sweet day of sacred rest" in quotation marks, citing the opening line of Isaac Watts's hymn "Sweet is the day of sacred rest," a paraphrase of Psalm 92 published in his 1719 Psalms of David.