About Whittier (from Wikipedia):
John Greenleaf Whittier (December 17, 1807 – September 7, 1892) was an American Quaker poet and advocate of the abolition of slavery in the United States. Frequently listed as one of the fireside poets, he was influenced by the Scottish poet Robert Burns. Whittier is remembered particularly for his anti-slavery writings, as well as his 1866 book Snow-Bound.
A number of his poems have been turned into hymns, including Dear Lord and Father of Mankind, taken from his poem “The Brewing of Soma”. The latter part of the poem was set in 1924 by Dr. George Gilbert Stocks to the tune of Repton by English composer Hubert Parry from the 1888 oratorio Judith. It is also sung as the hymn Rest by Frederick Maker, and Charles Ives also set a part of it to music in his song “Serenity”.
O Brother Man, fold to thy heart thy brother:
Where pity dwells, the peace of God is there;
To worship rightly is to love each other,
Each smile a hymn, each kindly deed a prayer.