In "Extremely Loud and Incredibly Close," Jonathan Safran Foer explores themes of loss, grief, and the search for meaning through the journey of a young boy named Oskar. After losing his father in the September 11 attacks, Oskar embarks on a quest to find the lock that matches a mysterious key he found among his father's belongings, leading him on an odyssey through New York City and into the lives of various strangers.

The quote "I could write more, but that is all that matters" encapsulates the author's ability to convey profound emotions succinctly. It signifies that sometimes the most impactful truths are best expressed with simplicity, reflecting the book's exploration of deep themes through the lens of a child who grapples with the complexities of love and loss.