The mere repetition with firm faith includes all the practical details, such as the threefold preparation of mind and the four practical rules. If I as an individual had any doctrine more profound than this, I should miss the mercy of the Two Honorable Ones, Amida and Shakyamuni, and be left out of the Vow of the Amida Buddha.
Those who believe this, though they clearly understand all the teachings Shakyamuni taught throughout His whole life, should behave themselves like simple-minded folks, who know not a single letter, or like ignorant nuns or monks whose faith is implicitly simple.
Thus without pedantic airs, they should fervently practice the repetition of the Name of Amida, and that alone."[1]