Rudy Rasmus' book talks about just that. When it really comes down to it, love is the foundation of all things. Rasmus discusses the depth of love. It is designed to be used individually or in a book club with discussion points called "Responding" for further thought presented at the end of each chapter.
What I like about this book is Rasmus' use of his own, real-life struggles with learning to love and learning to lean on the Lord in all situations of life knowing that He is love and His love NEVER fails.
If you are interested in learning more about how we can walk in God's love, this is a great book to gain that foundation. Rasmus ends the book with his own Love Revolution that says that our love:
"Trusts God always,
Always looks for the best,
Never looks back,
But keeps going to the end. (1 Corinthians 13:7)"