The atom bomb was no great decision. It was merely another powerful weapon in the arsenal of righteousness.
A devotee who can call on God while living a householder's life is a hero indeed. God thinks: 'He is blessed indeed who prays to me in the midst of his worldly duties. He is trying to find me, overcoming a great obstacle -- pushing away, as it were, a huge block of stone weighing a ton. Such a man is a real hero.'
Be patient. The path of self-discipline that leads to God-realization is not an easy path: obstacles and sufferings are on the path; the latter you must bear, and the former overcome -- all by His help. His help comes only through concentration. Repetition of God's name helps concentration.