Srimad Bhagavatam Canto 07, Chapter 02, Text 25-26


SB 7.2.25-26

esa atma-viparyaso
 hy alinge linga-bhavana
esa priyapriyair yogo
 viyogah karma-samsrtih
sambhavas ca vinasas ca
 sokas ca vividhah smrtah
avivekas ca cinta ca
 vivekasmrtir eva ca
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
In his bewildered state, the living entity, accepting the body and mind to be the self, considers some people to be his kinsmen and others to be outsiders. Because of this misconception, he suffers. Indeed, the accumulation of such concocted material ideas is the cause of suffering and so-called happiness in the material world. The conditioned soul thus situated must take birth in different species and work in various types of consciousness, thus creating new bodies. This continued material life is called samsara. Birth, death, lamentation, foolishness and anxiety are due to such material considerations. Thus we sometimes come to a proper understanding and sometimes fall again to a wrong conception of life.
Srimad Bhagavatam Canto 07, Chapter 02, Text 24
Srimad Bhagavatam Canto 07, Chapter 02, Text 27