Fasting is easy; celebrating is difficult. The ascetic gets a reputation, a role, a visible measure of his progress, and the ego that could not grow through wealth grows beautifully through renunciation. The question is asked with confidence because those who suffer for their religion cannot bear to see anyone happy in it.
Around a man who has arrived, festivity is natural. Nothing is denied because nothing is clung to; food is eaten when hunger comes and left when it does not. The fast worth keeping is of the mind, an hour in which thought is not fed and grows quiet from hunger.