One verse

Srimad Bhagavatam 11.29.2

11.29.2

प्रायश: पुण्डरीकाक्ष युञ्जन्ते योगिनो मन: । विषीदन्त्यसमाधानान्मनोनिग्रहकर्शिता: ॥ २ ॥

prāyaśaḥ puṇḍarīkākṣa yuñjanto yogino manaḥ viṣīdanty asamādhānān mano-nigraha-karśitāḥ

prāyaśaḥ
for the most part
puṇḍarīka-akṣa
O lotus-eyed Lord
yuñjantaḥ
who engage
yoginaḥ
yogīs
manaḥ
the mind
viṣīdanti
become frustrated
asamādhānāt
because of inability to attain trance
manaḥ-nigraha
by the attempt to subdue the mind
karśitāḥ
weary

O lotus-eyed Lord, generally those yogīs who try to steady the mind experience frustration because of their inability to perfect the state of trance. Thus they weary in their attempt to bring the mind under control.