Why is appreciation so powerful? – It is an expression of love for Krishna.
When something is pure it is natural. When something is contaminated it is unnatural. So purity of the heart means to bring us back to our natural state of loving God.
Material Nature is static & spiritual nature is ecstatic
The question we have to ask is not whether something is difficult or not, but rather whether it is right or not. If something is right, we should be willing to do anything and give everything for that purpose.