I might say Love is an emotion, not only a emotion. Perhaps it is only semantic difference? As you say Love is a unseen force suggesting a something beyond emotion, body, mind, spirit.  The drop that merges into the ocean, the ocean merges into the drop…

I speak in the metaphorical and symbolic – the language of poetry.  The metaphor of the finger that points to the moon, speaks of the words in which we use to describe the ‘moon’ being mistaken for the moon itself. Indeed we can see the ‘moon’ without words which may be the best way to experience it. Perhaps the desire is to share the experience, a motivation of  Love, that words get in the way, as we mistake the finger for the moon.

Language limits, that is its purpose .

Another saying is that the ‘Map is not the territory’. No matter how good a map is it can never capture everything about the territory.

The fruits of love are visible yet passing though our words, expectations, filters, fears, memories…  – we work for that which no work is required. In the context of the song the lyrics ‘What’s love got to do with it, What’s love but a second-hand emotion” the signer is referring to the experience of being close to someone that sets one hearts and emotions racing.  The heart and emotions being a affect of the experience that may or may not have anything to do with love. As you mentioned this is where a person ought to stop and ask themselves how their heart feels however that requires a great deal of self knowledge.