how does one know?

I think it is simply because it is always even better than it was last time. Doesn't have to be it, as I used to feel it must. It is just incredible that no one has ever been able, not even poets, to precise how much the heart can hold. If I am alive, my heart needs to beat to the beat of another heart - no matter how that sensation often drives one crazy and so often people advise caution. Without emotions of the full kind, we would not understand anything. Yes, I am an incurable romantic and it is a good thing.