When I speak of love I am not speaking of some sentimental and weak response. I am speaking of that force which all of the great religions have seen as the supreme unifying principle of life. Love is somehow the key that unlocks the door which leads to ultimate reality.
This Hindu-Moslem-Christian-Jewish-Buddhist belief about ultimate reality is beautifully summed up in the first epistle of Saint John: “Let us love one another; for love is God and everyone that loveth is born of God and knoweth God” [1 John 4:7].
from 1967 address to the anti-war group Clergy and Laity Concerned