Life is a spell so exquisite that everything conspires to break it.
Spring here is so intense, wonderful, renewing, and surprising that it both elates and hurts at the same time. I think Emily felt this way about many things. Because she was so aware and sensitive to the activities of nature and human kind, she noticed things that others didn't, and while she was awed and excited about it all, things also touched her so deeply that they broke her heart. Quite a cheerful, spring-like statement, if you ask me. One feels she would like to say more, and more seriously, about the nature of these conversions, and the pressures of them, etcetera, but I think she instinctively played it lightly out of respect for her relative's own beliefs.