Next to wisdom comes strength, physical and mental, another greatly needed requisite of human life. A man needs mind-force to rule his own mind and body as well as those of others to whom he is related, in order to maintain harmony within and without. He needs also physical strength to defend himself and others against attacks and aggressions and prevent encroachments by others upon his property and interests. The Kshatriyas (Kings) form and supply this requisite to the four-caste organism. They form the arms of the Caste-Body, arms being symbolical of strength and ruling power. Without a powerful, noble ruler, all communities of men are liable to find themselves in disorder and inharmony and to suffer from lawlessness and injustice, just as a man who has no strength to defend himself from aggression is liable to be robbed of his possessions and be miserable. More important than the duty of protecting the life and property of his subjects is the King's duty to help their moral and spiritual well-being. And this the king does by enforcing the performance of the religious duties appertaining to each of the three castes as enjoined in the Vedic laws, discovered and enunciated by the holy ones. Those who do not perform these duties and practices are punished by temporary excommunication and, if still persistent in disobeying the injunctions, by absolute banishment from all societies. These early sages have always held that prevention is better and easier than cure of diseases, physical, mental or spiritual. Regular spiritual practices, performed daily, form habits, and spiritual habits cleanse the impurities of the mind which then becomes fit to reflect the highest spiritual truths by the light of which man witnesses the unity of all Nature, feels the ecstasy of the One Essence which pervades it and stands face to face with his Maker.