The Gospel of John has more occurrences of the word "love" than Matthew, Mark, and Luke put together. "Love" is used in one form or another over fifty times. For a devotion, a person could read through the Gospel of John and carefully mark each time the word "love" is used. But simply looking at the first and last times offers an important lesson.
The first time is John 3:16: "For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish but have eternal life."
The last time is John 21:20: "Peter turned and saw the disciple whom Jesus loved following them...."
The lesson is this: God loves the whole world and all people to the point of freely sacrificing His only Son. But this cosmic, worldwide love is at the same time a personal love felt deeply by the one who believes in Jesus.
Make the Gospel of John your own. Believe that "the Lamb of God, who takes away the sin of the world" (John 1:29) knows, loves, and forgives you personally.