The Six-syllable Mantra
The six-syllable mantra has the power to counteract all your negative emotions and to bring you unimaginable benefit, but it cannot be fully effective if you do not recite it with the proper concentration. If you are always being distracted as you recite it by bodily sensations, different things to look at, idle talk with others, or your own wandering thoughts, the mantra's power, like the luster of a piece of gold encrusted with dirt, will never make itself felt. Even if the beads of your rosary whirl through your fingers at breakneck speed, what use could such an empty facade of practice possible be? The point is not to accumulate a huge number of recitations at any cost, but to gain a deeper understanding of the practice and its goal.
-- H.H. Dilgo Khyentse Rinpoche, The Heart Treasure of the Enlightened Ones, translated by the Padmakara Translation Group, Shambhala Publications,
Boston & London, 1992, page 159.