What is the essence of all religions?

There is nothing greater or more blessed than the Love of God! It gives healing to the sick, balm to the wounded, joy and consolation to the whole world, and through it alone can man attain Life Everlasting. The essence of all religions is the Love of God, and it is the foundation of all the sacred teachings.

'Abdu'l-Baha, Paris Talks, p. 82