Happiness is like a butterfly. The more you chase it, the more it will elude you. But if you turn your attention to other things, it comes softly & sits on your shoulders. Happiness can be defined as a pleasant sensation and unhappiness is an unpleasant sensation experienced by one self through mind and/or intellect. In this world what one feels favorable is happiness and whatever one feels like despising is unhappiness. One regards what is dear to oneself as happiness and the same thing when it is disliked, as unhappiness.
Although initially it is necessary for the sense organs to have contact with external objects for generation of worldly happiness and unhappiness, yet man experiences them with his mind. Spiritual happiness or sorrow is always psychological. Finally the experiencing of all happiness or unhappiness is solely dependent on the mind. So it is impossible to restrain those experiences of happiness and unhappiness with the mind.
Happiness and unhappiness are reward and punishment respectively, which are bestowed upon man by the nature for his progress.
