The problem of 'how we know that we know something' (cognition of cognition) has seldom been dealt with by Western philosophers. It is an important problem for many aspects of life and thought. Pandit Vishwabandhu in this book gives us a comprehensive solution to this problem.
Avoid excessive merriment. A mind in that state never becomes calm; it becomes fickle. Excessive merriment will always be followed by sorrow. Tears and laughter are near kin. People so often run from one extreme to the other.
-Swami Vivekananda