This practice [turning a prayer wheel] is the easiest way to purify all the negative karmas. Even the heaviest ones, the uninterrupted negative karmas, get purified through turning a prayer wheel. Even a fully ordained person who has broken all four root vows will get purified. Negative karmas are completely purified, one collects merit like the sky, and one especially develops compassion.
— Lorne Ladner, The Wheel of Great Compassion by Lorne Ladner, editor