1 John 4:7-12—Beloved, let us love one another, for love is from God; and everyone who loves is born of God and knows God. The one who does not love does not know God, for God is love. By this the love of God was manifested in us, that God has sent His only begotten Son into the world so that we might live through Him. In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. Beloved, if God so loved us, we also ought to love one another. No one has seen God at any time; if we love one another, God abides in us, and His love is perfected in us.
Naturalism (the view that the natural world is all that exists) rules out such a lofty view of love. Indeed, when we consider the explanatory resources available to the naturalist, we realize that if Naturalism were true, love could only be another feature of organisms that helps us pass on our genetic material. This is what keeps everyone's favorite six-year-old awake at night:
Something to think about.