"Nevin, Edwin Henry, D.D., son of Major David Nevin, was born at Shippensburg, Pennsylvania, May 9, 1814. He graduated in Arts at Jefferson College, 1833; and in Theology at Princeton Seminary, in 1836. He held several pastorates as a Presbyterian Minister from 1836 to 1857; then as a Congregational Minister from 1857 to 1868; and then, after a rest of six years through ill health, as a Minister of the Reformed Church, first at Lancaster, Pennsylvania, and then inPhiladelphia. Dr. Nevin is the author of several hymns." [from Hymnary.org]
The letter referenced is one that is possessed by a Lancaster County resident in which Mr Lincoln, prior to being elected President, expresses his support for a national tariff to protect domestic businesses.