Definition of "profoundest"

The capacity of sorrow belongs to our grandeur; and the loftiest of our race are those who have had the profoundest grief; because they have had the profoundest sympathies.

1850, Henry Giles, “The Moral Spirit of Byron's Genius”, in Lectures and Essays, volume 1, Boston: Ticknor, Reed and Fields, page 149

The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is, to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

1852, Nathaniel Hawthorne, The Blithedale Romance‎, Boston: Ticknor, Reed and Fields, ch. 2

The workings of the human heart are the profoundest mystery of the universe.

1901 October, Charles Waddell Chesnutt, The Marrow of Tradition, Boston, New York: Houghton, Mifflin, page 233

The profoundest act of worship is to try to understand.

1994, “The Word of God”, Catherine Faber (music), performed by Echo's Children