Detachment, objectivity, is an invaluable aid to clear thinking; it enables a man to sum up a given situation without bias, personal or otherwise, and to act in that situation with courage and discretion. Another gift it bestows is that of concentration -- the ability to focus the mind and keep it steadily fixed on a single point ('ekaggata', or one-pointedness), and this is the great secret of success in any undertaking. The mind is hard to tame; it roams here and there restlessly as the wind, or like an untamed horse, but when it is fully under control, it is the most powerful instrument in the whole universe. He who has mastered his own mind is indeed master of the Three Worlds.
In the first place he is without fear. Fear arises because we associate mind and body ('nama-rupa') with "self"; consequently any harm to either is considered to be harm done to oneself. But he who has broken down this illusion by realizing that the five 'khandha' process is merely the manifestation of cause and effect, does not fear death or misfortune. He remains equable alike in success and failure, unaffected by praise or blame. The only thing he fears is demeritorious action, because he knows that no thing or person in the world can harm him except himself, and as his detachment increases, he becomes less and less liable to demeritorious deeds. Unwholesome action comes of an unwholesome mind, and as the mind becomes purified with Meditation, healed of its disorders, bad kamma ceases to accumulate. He comes to have a horror of wrong action and to take greater and greater delight in those deeds that are rooted in 'alobha', 'adosa', and 'amoha' -- generosity, benevolence and wisdom.