“The unalloyed devotees of the Lord know the glories of the Lord in the sense that they can understand how great the Lord is and how great is His expansion of diverse energy. Those who are attached to the perishable body can hardly enter into the realm of the science of Godhead. The whole materialistic world, based on the conception of the material body as the self, is ignorant of the science of God.” (Shrila Prabhupada, Shrimad Bhagavatam, 2.7.42 Purport)