I would suggest that they mean that love

 like beauty, means many things to many people and exists in the eye of the beholder. No universal scale or definition is possible although they share commonalities, e.g. affection; intimacy; tenderness; caring; sharing; respect; understanding; contentment; emotional attachment and dependency; and depth of communication verbal and, especuially, non-verbal, etc. It is what it is. It is antipathetic to everything that is damaging, hateful and non-sustaining.

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