O, she that hath a heart of that fine frame
To pay this debt of love but to a brother,
How will she love when the rich golden shaft
Hath killed the flock of all affections else
That live in her.

– William Shakespeare

Twelfth Night, Act 1, Scene 1. Orsino’s response to Olivia’s avowal of grief for her brother. He thinks that because Olivia loves her brother so much that she mourns for him for seven years, she will come to love Orsino that much also.