that dwells in Heaven speeds instantly to love,
as light rays to a shining surface would;
Just as much ardor as it finds, it gives:
the greater the proportion of our love,
the more eternal goodness we receive;
The more souls there are above who are in love
the more there are worth loving;
love grows more,
each soul a mirror mutually mirroring.
- Dante, from his Purgatorio (Canto XV)