Therefore, spiritual education begins from this body. As Krsna says in the Bhagavad-gita, dehino 'smin yatha dehe [Bg. 2.13]. Asmin dehe, in this body there is the spiritual spark who is the proprietor of the body. This is the beginning of spiritual education.
So this Krsna consciousness movement means training people how to become tapasvi, tapasvi, who is undergoing tapasya, regulative, so that he may be cured from this permanent disease, birth, death, old age and disease.
By H.D.G. Srila Prabhupada