Know that happiness is beyond comfort and sorrow. Comfort and sorrow are just the manifestations of the human mind. The state which is beyond this pleasure and grief is truly happiness. You can realize this state when you listen to the voice within you. God is present within you and He truly speaks to you from within. To experience that inner voice, you must silence your mind. You must control the activity of the external senses. When the inner and outer organs are completely controlled, you will clearly hear the Lord, speaking to you, from within.