The bible tells us God is love. Because God is unknowable and undefinable, love must be the same.
"Anyone who does not love does not know God, because God is love... Whoever lives in love lives in God, and God in him." (1 John 4:8, 16)
God is love. It is bestowed on us by the divine and belongs in the mortal realm. The only pure instance of true, everlasting love is the love that exists between God and man. Everything else is human love, which is transient and cannot be classified as true love. Because God is unknowable and the divine realm is beyond our mortal comprehension, love is also beyond what is knowable. We may be able to recognise the effects of love, but we cannot hope to define love or understand it.
Science has explained many aspects of love. It has explained why we love certain people and not others through its theory of evolution. It has explained why we remain committed to one person for a period of time. It has even explained universal perceptions of beauty and can separate familial love from romantic love. Love is inherently knowble and definable. We can detect love in the animal kingdom. Dating apps can effectively predict when love will occur. Love does not reside in the divine realm. It sits in our brains, is transported in our hormones and is expressed in our actions. It is a physical phenomenon explicable through scientific research.
[P1] God is love. [P2] God is unknowable and undefinable. [P3] Therefore, love is unknowable and undefinable.
[Rejeting P1] God is not love. Love is hormones, neurochemistry and evolution in action.