When we are angry at each other, our hearts get further apart. To cover that distance, we have to shout to reach across the divide and be heard. The angrier we get, the louder we shout to be heard from such a great distance.
When we fall in love, what happens? We talk softly to each other. Why? Because our hearts are close. The distance between us is very small.
The stronger the love, we more we whisper because our hearts are so close. With the strongest love we only need to look at each other. There is no separation.