Prabhupada's lecture - Śrīmad-Bhāgavatam 1.3.20 - Los Angeles, September 25, 1972
So to become too much materially opulent means that is another danger. Bhaktivinoda Ṭhākura has said therefore, jaḍa-vidyā jato māyāra vaibhava. The expansion of material advancement... Material advancement means expanding the sense gratificatory process. That is material. The more you expand how to satisfy your senses, that is material. And the more we expand how to satisfy Kṛṣṇa, that is spiritual. That is the difference between material and spiritual. It does not mean that material stone, material, and spiritual means it becomes zero.
They are thinking like that. Śūnyavādi. They think spiritual means just the opposite number of material. "So material, we have got variegated experience, solid experience, so make it zero." That is not spiritual. That is simply negation. That philosophy is the Buddha philosophy, that "You are suffering from some disease painful, so I cut your throat. That's all. Everything finished. No more suffering. Zero. Make it zero." No. The process should be, if you are diseased, if you are suffering, the suffering should be stopped. Not that to kill you to stop the suffering. No. That is our philosophy.