The Shurangama Sutra, Great Strength Bodhisattva's Perfect Penetration Through Mindfulness of the Buddha - A Simple Explanation (Hardcover, English ed.)

If we recite the Buddha's name single-mindedly, we can control the six sense faculties, remain unmoved by states, and put an end to random thoughts. If our recitation becomes uninterrupted, then we will surely be born in the Land of Ultimate Bliss.--Venerable Master Hua