If we are hungry spiritually, we would like to take spiritual food. We feed our body; we should feed the body with good healthy food. We feed our mind through our studies---the ideas should be good. Similarly, we should feed the soul. How to do it? Through the practice of worship, japa, meditation.
There is a parable of Sri Ramamkrishna: A child was going to bed and said, 'Mummy, if i feel hungry, please wake me up,' and the mother said, 'I need not do that. Your hunger itself will wake you up.' There comes a time in the course of the evolution of the soul when we become spiritually hungry and wake up from our age-long slumber. But then, mere waking up is not enough. We must be up and doing.
I am reminded of a remarkable saying of the Holy Mother. She said: 'The room may contain different kinds of food-stuff, but one must cook them. He who cooks earlier gets his meals earlier too.' Many of us are lazy, we do not want to cook at the proper time; may be, we want to cook but late in the evening; and some are so lazy that they would rather starve than cook their food! Naturally, they cannot get much out of spiritual life and they feel miserable.
(pgs. 308-309, Meditation and Spiritual Life)