Is spiritual practice necessary?

Sri Ramakrishna wanted to see the Wilson Circus. 

Sri Ramakrishna said to M.: "Did you see how that Englishwoman stood on one foot on her horse, while it ran like lightning? How difficult a feat that must be! She must have practised a long time. The slightest carelessness and she would break her arms or legs; she might even be killed. One faces the same difficulty leading the life of a householder. A few succeed in it through the grace of God and as a result of their spiritual practice. But most people fail. Entering the world, they become more and more involved in it; they drown in worldliness and suffer the agonies of death. A few only, like Janaka, have succeeded, through the power of their austerity, in leading the spiritual life as householders. Therefore spiritual practice is extremely necessary; otherwise one cannot rightly live in the world."

Source: Gospel of Sri Ramakrishna