Concentration means only one thought. But there are usually many different thoughts in the mind. So how do we control them? We have to channel all our thoughts towards a greater one; a stronger and more positive one. And the strongest and most positive thought is that of bliss; perfect peace and contentment – the essence of our existence.
That positive thought is introduced into the mind through what we call a mantra. Man means “mind,” and tra means “that which liberates.” So mantra means a word or phrase which “liberates the mind.” Although we rely mostly on our eyes, sound actually has the most powerful effect on the mind. So the internal sound of a mantra is the most powerful way of concentrating the mind. It concentrates the mind on a particular idea – the idea (or rather feeling) of infinite peace and happiness.
The practices of Ananda Marga encompass a wide range of techniques for physical, mental and spiritual development, the central practice being meditation. Meditation means to look within your mind to feel the bliss that is the essence of your existence. That bliss is within you, just as it is within everybody and everything.