Incarnate God! the soul that knows. J. Newton. [Safety of the Believer.] Published in the Olney Hymns, 1779, Bk. i., No. 47, in 8 stanzas of 4 lines, and headed "The Believer's Safety. Psalm xci." It is in use in its original form, and also as, "O God most high, the soul that knows." This altered form of stanzas i., vi.-viii. was made by W. J. Hall for his Mitre Hymn Book, 1836, No. 83. Sometimes, as in the New Mitre, 1875, a doxology is added.
--John Julian, Dictionary of Hymnology (1907)