Everyone should know that a living entity is eternally a servant and that unless one serves Kṛṣṇa one has to serve illusion in different varieties of the three modes of material nature and thus wander perpetually within the cycle of birth and death; even the so-called liberated Māyāvādī speculator has to undergo this process. This knowledge constitutes a great science, and each and every living being has to hear it for his own interest.
People in general, especially in this Age of Kali, are enamored by the external energy of Kṛṣṇa, and they wrongly think that by advancement of material comforts every man will be happy. They have no knowledge that the material or external nature is very strong, for everyone is strongly bound by the stringent laws of material nature. A living entity is happily the part and parcel of the Lord, and thus his natural function is to render immediate service to the Lord.