One verse

Srimad Bhagavatam 5.11.4

5.11.4

यावन्मनो रजसा पूरुषस्यसत्त्वेन वा तमसा वानुरुद्धम् । चेतोभिराकूतिभिरातनोतिनिरङ्कुशं कुशलं चेतरं वा ॥ ४ ॥

yavan mano rajasa purusasya sattvena va tamasa vanuruddham cetobhir akutibhir atanoti nirankusam kusalam cetaram va

yavat
as long as
manah
the mind
rajasa
by the mode of passion
purusasya
of the living entity
sattvena
by the mode of goodness
va
or
tamasa
by the mode of darkness
va
or
anuruddham
controlled
cetobhih
by the knowledge-acquiring senses
akutibhih
by the senses of action
atanoti
expands
nirankusam
independent like an elephant not controlled by a trident
kusalam
auspiciousness
ca
also
itaram
other than auspiciousness, sinful activities
va
or

As long as the mind of the living entity is contaminated by the three modes of material nature (goodness, passion and ignorance), his mind is exactly like an independent, uncontrolled elephant. It simply expands its jurisdiction of pious and impious activities by using the senses. The result is that the living entity remains in the material world to enjoy and suffer pleasures and pains due to material activity.