Love in Light of the First Law of Thermodynamics

I often attempt to explain how the disappearance of love's excitement does not imply the love's insincerity. We often accuse love for not being genuine because the spark is no longer there, the butterfly in the stomach gone.

I like to use Newton's First Law of Thermodynamics as a model to explain this phenomenon, which states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another.

NOT DESTROYED

Yes, the euphoria of juvenile love diminishes as we mature in relationship. Although we very much enjoy each other's company, we lack the excitement and electric shock we had during out first years.
There is nothing out of the ordinary here; it is as expected. In fact, it could be a sign of growth.

The reason why the first excitement or joy fades away is to give space for a new kind of joy. The new joy does not replace the former joy, but enrich it. You may not feel the butterfly in your stomach anymore, but you have the joy of child-bearing, the joy of raising a child. When the child has grown into an adult, you will yet experience a different joy, that is in watching your children's children grow, and so on and so forth. For who can withstand a constant excitement and euphoria for a prolonged period of time? We would eventually get tired and sick of it ourselves! Like a child who eats too much candy. At first it tastes heavenly, but after days of sucking a lolly, his stomach would start to ache and the last thing he wishes to do is to have another candy.

Love changes from one form to another. When you grow old and grey, you may not possess the spark of youth, for it has been transformed into the strength of mature love, finely tested by time. It is at that moment that you may gaze into your partner's eyes and frames of moments would be projected: the moments when you were there for each other through illness, through adversaries, through disagreements. Yet above all, still you say "I would go through it all over again for you."

NOT CREATED

Back to Newton's First Law of Thermodynamics: "energy can neither be created nor destroyed [...]".
We have talked about the transformation (and not destruction) of love.

But how is love not created?

Man, Pureé and Apple Pie

I find a man oddly comparable to a bowl of rustic vegetable pureé,
or to a sloppily cut slice of a classic apple pie,
what difference is there?

Since harvest, all were collected, selected and piled, observed and judged,
Stripped and peeled and cored and cut,
Salted and drowned we must, with sour, sweet, and rather bitter spice,
Before then thrown into a furnace of flame.

At dinner, people gather round the table,
Hand-in-hand saying grace.
'Grace?'
Man search for grace round the table,
But grave—not grace—was what man found.

For as often as grace dances a hideous waltz,
As it hides under the veil of suffering,
Love shall sing an uneasy tune,
Chained in a chair, forced into a confession.

But alas! See the Man being passed around,
In the dining table that last supper,
To quench the thirst of many,
'He' was grace grief could not stand before.

Ode to a Crescent Moon

what elegance, O Queen of bleak sky,
   though dire wolves await thee bid adieu!
as stars shine bright to glow and die,
   thou still and silent through the night.

bent of mystery, cry of deep misery,
  of a maiden's love--yet to be requited,
what beauty to see, what's hidden from me,
  an enigma dark from mine own sight.

when crescent gone, as dogs howl low,
   a beast of bumps and tainted flesh,
unfolds all secrets now to show
   what it means to be whole again.