Many forget that our main practice is Lord Buddha remembrance. This involves chanting Namo Amituofo. We can chant out loud or we can just say it over and over in our minds and it becomes a meditation. Meditations are to 'guard or protect the mind'.When you are reciting a mantra, your mind has a hard time of thinking of much else, so this is one way to protect the mind. With a single recitation of Namo Amituofo you destroy countless eons of bad karma.