Excerpt from Gandhi's Experiments with Truth:

"Whenever you are in doubt, or when the self becomes too much with you, apply the following test. Recall the face of the poorest and the weakest man whom you may have seen, and ask yourself if the step you contemplate is going to be of any use to him. Will he gain anything by it? Will it restore him to have control over his own life and destiny? In other words, will it lead to swaraj for the hungry and spiritually starving millions? Then you will fine your doubts and yourself melting away."