…e of a faith background different than myself…and still others with no faith background whatsoever. Perhaps I’m reading too much into this short declaration, but you could argue that the message here is: No act of love can exist unless instigated by a Christian. Whether that’s the intended message or not, yours truly doesn’t believe in it. For whatever that’s worth to you.
What Graham is saying in the quote in question is that there is a love quality to God such that while we can choose to love with our will, love that comes out of our will never can have the same quality as love that is essence of God — love that only can be received through the Holy Spirit.
Consider the following. You and I can make a profit of US$100,000, respectively from trading in stock ABC and stock XYZ say. The profit we have made is exactly the same yet stock ABC may be better regarded or have a higher value than stock XYZ. So people can profit from our love — love that has nothing to do with Jesus Christ — yet the value of our love never can approximate value of love that is essence of God, essence of Jesus Christ.
This is akin to saying that relative to love of God, love man generates from his will is no better than filthy rags.
To be born of the Spirit is to have nature of God, Father of Jesus Christ. And yes, only via receipt of that nature do we stand a good chance of loving with the same quality of love we have received from Jesus Christ.