"If you cannot do something which is hard for you, you do anything for Krishna under the direction of spiritual master, you'll get perfection. It is not that 'I have to do this. I have to do that.' No. Krishna's service is manyfold. If one is unable to take one kind of service, the spiritual master can give him another kind of service. But both the services are accepted by Krishna."
(Srila Prabhupada Lecture, Mayapur, March 12, 1976)