Meditation is central to all spiritual life, whatever be the religion one follows. Swami Ritajananda, who had wide experience with spiritual seekers both in India and abroad, has very clearly set forth the principles and practice of meditation. The part played by the guru and the mantra are lucidly set forth. Quotations are also given from the Scriptures to explain the various factors involved in meditation.
There is only one sin -- and that sin is weakness. When I was a boy, I read Milton's Paradise Lost. The only good man I had any respect for was Satan. The only saint is the soul who never weakens, faces everything, and determines to die game.
-Swami Vivekananda