Seems like the original quote is from "Materialized Apparitions: If Not Beings from Another Life, What Are They" written in 1885 by Edward Augustus Brackett.
"Science may wrangle over the supposed movements of molecules and atoms, and the correlation of forces; may dissect the bird to find its song; but love alone shall set the boundaries of knowledge."
"Science may wrangle over the supposed movements of molecules and atoms, and the correlation of forces; may dissect the bird to find its song; but love alone shall set the boundaries of knowledge."