Surprised by Joy
Never realized the double meaning until now! Joy as in happiness and Joy Gresham.
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“We must try not to sink beneath our anguish, Harry, but battle on.” -Albus Dumbledore
If I remember right, the "Joy" in the title of "Surprised by Joy" was referring to the joy Lewis found in Christ when he converted to Christianity, and that book was actually written before he met Ms. Gresham.
The book he wrote about his relationship with Ms. Gresham as depicted in this movie was entitled "A Grief Observed".
So the "double meaning" was prophetic!