Your success and happiness lie in you. External conditions are the accidents
of life, its outer trappings. The great, enduring realities are love of service.
Joy is the holy fire that keeps our purpose warm and our intelligence aglow.
Resolve to keep happy, and your joy and you shall form
an invincible host against difficulty.

Out of the Dark: Essays, Lectures, and Addresses on Physical and Social Vision (ed. 1920)