Srimad Bhagavatam Canto 11, Chapter 18, Text 26

SB 11.18.26

naitad vastutaya pasyed
 drsyamanam vinasyati
asakta-citto viramed
 ihamutra-cikirsitat
 
Translation: 
 
One should never see as ultimate reality those material things which obviously will perish. With consciousness free from material attachment, one should retire from all activities meant for material progress in this life and the next.
 
Purport: 
 
One may doubt how a gentleman can retire from family life and live as a beggar, eating meager foodstuffs. The Lord here responds by stating that sumptuous or palatable foods — along with all other material objects, such as the body itself — should never be seen as ultimate reality, since they are obviously perishable items. One should retire from material programs destined to enhance the quality of one’s illusion both in this life and the next.
Srimad Bhagavatam Canto 11, Chapter 18, Text 25
Srimad Bhagavatam Canto 11, Chapter 18, Text 27