“The ethic of Reverence for Life is the ethic of Love widened into universality.”
Epilogue, p. 235 http://books.google.com/books?id=jHuYuLugqBAC&q=%22The+ethic+of+Reverence+for+Life+is+the+ethic+of+Love+widened+into+universality%22&pg=PA235#v=onepage
Out of My Life and Thought : An Autobiography (1933)