This morning I was reading from the Forth Canto of the Srimad Bhagavatam about the process of mantra meditation. I have always loved this story of Druva Maharaja, and his determination in meditation, on the form of the Lord. We have included the entire text and purport.
O son of the King, now I shall speak unto you the mantra which is to be chanted with this process of meditation. One who carefully chants this mantra for seven nights can see the perfect human beings flying in the sky. (SB4.8.53