If he meditate on one Mâtrâ (the A), then, being enlightened by that only, he arrives quickly at the earth. The Rik-verses lead him to the world of men, and being endowed there with penance, abstinence, and faith, he enjoys greatness.

In plain words: Om has three sounds: A, U and M. Someone who meditates only on the first sound, A, is soon reborn on earth as a human. There, with self-discipline, self-control and faith, that person lives a great life.