"Any entity may at any time instantaneously clear and balance its energy centers."

[Jeremy]

I think it means that clearing your energy centers with the determined desire and will to achieve the purest state so that the healer can become the conduit between the person requesting the healing and the creator. But this is only during that instance. By nature, I think it means a person who performs healing as a trade. The reason being is that one must be quite grounded to attempt healing on a consistent basis otherwise the healer can become detuned and absorb some of that which they are attempting to heal.