One verse

Srimad Bhagavatam 11.23.59

11.23.59

सुखदु:खप्रदो नान्य: पुरुषस्यात्मविभ्रम: । मित्रोदासीनरिपव: संसारस्तमस: कृत: ॥ ५९ ॥

sukha-duḥkha-prado nānyaḥ puruṣasyātma-vibhramaḥ mitrodāsīna-ripavaḥ saṁsāras tamasaḥ kṛtaḥ

sukha-duḥkha-pradaḥ
giver of happiness and distress
na
there is no
anyaḥ
other
puruṣasya
of the soul
ātma
of the mind
vibhramaḥ
bewilderment
mitra
friends
udāsīna
indifferent parties
ripavaḥ
and enemies
saṁsāraḥ
material life
tamasaḥ
out of ignorance
kṛtaḥ
created

No other force besides his own mental confusion makes the soul experience happiness and distress. His perception of friends, neutral parties and enemies and the whole material life he builds around this perception are simply created out of ignorance.