I thought this was pretty (and oddly insightful for a fantasy novel)

Love, honest love, requires empathy. It is a sharing - of joy, of pain, of laughter, of tears. Honest love makes one's soul a reflection of the partner's moods. And as a room seems larger when it is lined with mirrors, so do the joys become amplified. And as the individual items within the mirrored room seem less acute, so does pain diminish and fade, stretched thin by the sharing.
That is they beauty of love, whether in passion or friendship. A sharing that multiplied the joys and thins the pains.

- Drizzt Do'Urden in R.A. Salvatore's The Silent Blade