Prayer, before anything else, is a need, as when you feel hungry and want to eat immediately. It is the same with prayer, a spiritual hunger- when man feels its intensity he wants to pray immediately.This means that prayer is a pressing need with every human being, and we will not be at peace until the need is fulfilled.
It also means that if we pray without true hunger our prayer becomes a sham, as food is to a person who is not hungry. It is said that food to the satiated is a loss, and so with prayer- it is a loss to him who is not hungry or thirsty in his spirit for God.