Is there any way to define Divine Love?
Define? No. Describe? Yes. To define something, you have to draw a boundary around it. Divine Love is infinite, so it is impossible to define the infinite. On the other hand, to describe something, you have to first
experience it. There are many ways to describe the experience of Divine Love.
My suspicion is that we are swimming in it all day, every day. Existence itself is Divine Love?
Indeed yes. I am fond of the biblical reference where Paul says, "In him we live and move and have our being". That is true. But we are not always perspective of that as we get wrapped up in the affairs of the separate self trying to find itself in this world, rather than just resting in the Divine.
Seeing God, or the Divine if you prefer, is a matter of perception. It is the eyes through which we see. There is a perfect quote from the Christian mystic Meister Eckhart which captures what this unity of Self and perception is experienced as:
"The eye through which I see God is the same eye through which God sees me; my eye and God's eye are one eye, one seeing, one knowing, one love."