“Love is not a feeling, it is a test.”
That is to say, there is nothing passive at play here. It doesn't just happen to you and then pass on. Even if we say that it happens unexpectedly, it creeps up, still it involves some work. Something is to be done. Put into a real situation, this is how we tell that it is love. Not that it can exist in the quiet ideal separtion from the world, but that it exists alongside one, through one's life in the functioning natural world. It becomes part of who we are. We are not a love sufferer, but a love dweller, we fight for love, fight for this change in who we are. A change in our priorities, in who and what we care about.