The bible is not a blueprint for every day of your life, it is an inspiration not a blueprint. That requires that we listen to one another and get challenged and grow by living with difference within the body of the church.
Even if the being is not entirely purified, varieties of inspirations and powers may come down from above but this may lead to serious errors. Inspirations from above mixing with the impurities from below get all muddled up and the sadhak takes this for an absolute command. Many a sadhak has thus fallen into danger. Therefore, one must particularly lay stress on the purification of the being.