". . . he has put eternity into man's heart . . ." (Eccl. 3:11, ESV)
I am thankful for a 1999 class at Wheaton College on C. S. Lewis, taught by Jerry Root, which helped me for the first time put my finger on this in my own heart. Lewis has always evoked the eternity in my heart more than any other writer, such as in the below post.