"We are never really happy until we are helping others."

"I am sure that the true way to make a life happy is to make it useful."

"Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it."

"It is for us to pray not for tasks equal to our powers, but for powers equal to our tasks."

"Self-pity is our worst enemy and if we yield to it, we can never do anything good in the world."