God's love is as objective as light. Because the sun in a sense is light, or the source of light rather than being lit, it really gives its light to the earth. And because the earth really receives light from the sun, it is really transformed every morning from darkness to light. Just as objectively, because God is love, God really gives love to us. And because we receive real life-changing love from God, we are really transformed from darkness to light. - Peter Kreeft