Srimad Bhagavatam Canto 11, Chapter 23, Text 42

SB 11.23.42

dvija uvaca
nayam jano me sukha-duhkha-hetur
 na devatatma graha-karma-kalah
manah param karanam amananti
 samsara-cakram parivartayed yat
 
Translation: 
 
The brahmana said: These people are not the cause of my happiness and distress. Neither are the demigods, my own body, the planets, my past work, or time. Rather, it is the mind alone that causes happiness and distress and perpetuates the rotation of material life.
Srimad Bhagavatam Canto 11, Chapter 23, Text 41
Srimad Bhagavatam Canto 11, Chapter 23, Text 43