Survival means
Srimad-Bhagavatam
SB Canto 8
If one actually wants happiness, one must go to the spiritual world. The material world is characterized by a struggle for existence, and survival of the fittest is a well-known principle, but the poor souls of this material world do not know what is survival and who is fit. Survival does not mean that one should die; survival means that one should not die, but should enjoy an everlastingly blissful life of knowledge. This is survival. The Kṛṣṇa consciousness movement is meant to make every person fit for survival. Indeed, it is meant to stop the struggle for existence. The Śrīmad-Bhāgavatam and Bhagavad-gītā give definite directions on how to stop the struggle for existence and how to survive in eternal life. The saṅkīrtana movement, therefore, is a great opportunity. Simply by hearing Bhagavad-gītā and chanting the Hare Kṛṣṇa mahā-mantra, one becomes completely purified. Thus the struggle for existence ceases, and one goes back home, back to Godhead.