Many people seem to think that the spiritual life necessarily requires a definite and exacting plan of study. It does not. But it does require a definite plan of life; and courage in sticking to the plan, not for merely days or weeks, but for years.
It is the business of the preacher, not only to state moral truths, but to inspire his hearers with a realizing sense of their value, and to awaken in them the desire to act accordingly. He can do this only by putting his own purpose as a yeast into their hearts. The influence of the right sort of preachers cannot be spared. The human race is not yet so far advanced that it can dispense with the impulses that come from men of more than average intensity of moral energy. Let us produce, through the efficacy of a better moral life and of a deeper moral experience, a surer faith in the ultimate victory of the good.
As the Director of the Theoretical Division of Los Alamos, I participated at the most senior level in the World War II Manhattan Project that produced the first atomic weapons. Now, at age 88, I am one of the few remaining such senior persons alive. Looking back at the half century since that time, I feel the most intense relief that these weapons have not been used since World War II, mixed with the horror that tens of thousands of such weapons have been built since that time?one hundred times more than any of us at Los Alamos could ever have imagined. Today we are rightly in an era of disarmament and dismantlement of nuclear weapons. But in some countries nuclear weapons development still continues. Whether and when the various Nations of the World can agree to stop this is uncertain. But individual scientists can still influence this process by withholding their skills. Accordingly, I call on all scientists in all countries to cease and desist from work creating, developing, improving and manufacturing further nuclear weapons - and, for that matter, other weapons of potential mass destruction such as chemical and biological weapons.