Bhagwad Gita
Chapter 15, Verse 7
ममैवांशो जीवलोके जीवभूतः सनातनः।मनःषष्ठानीन्द्रियाणि प्रकृतिस्थानि कर्षति।।15.7।।
The living entities in this conditioned world are My eternal, fragmental parts. Due to conditioned life, they are struggling very hard with the six senses, which include the mind.