One verse

Srimad Bhagavatam 11.2.38

11.2.38

अविद्यमानोऽप्यवभाति हि द्वयो ध्यातुर्धिया स्वप्नमनोरथौ यथा । तत् कर्मसङ्कल्पविकल्पकं मनो बुधो निरुन्ध्यादभयं तत: स्यात् ॥ ३८ ॥

avidyamāno ’py avabhāti hi dvayo dhyātur dhiyā svapna-manorathau yathā tat karma-saṅkalpa-vikalpakaṁ mano budho nirundhyād abhayaṁ tataḥ syāt

avidyamānaḥ
not present in reality
api
although
avabhāti
is manifest
hi
indeed
dvayaḥ
duality
dhyātuḥ
of the person experiencing
dhiyā
by the intelligence
svapna
a dream
manaḥ-rathau
or the conceiving of a desire
yathā
as
tat
therefore
karma
of material activities
saṅkalpa-vikalpakam
having the functions of forming positive and negative desires
manaḥ
the mind
budhaḥ
an intelligent person
nirundhyāt
should bring under control
abhayam
fearlessness
tataḥ
in this way
syāt
there may be

Although the duality of the material world does not ultimately exist, the conditioned soul experiences it as real under the influence of his own conditioned intelligence. This imaginary experience of a world separate from Kṛṣṇa can be compared to the acts of dreaming and desiring. When the conditioned soul dreams at night of something desirable or horrible, or when he daydreams of what he would like to have or avoid, he creates a reality that has no existence beyond his own imagination. The tendency of the mind is to accept and reject various activities based on sense gratification. Therefore an intelligent person should control the mind, restricting it from the illusion of seeing things separate from Kṛṣṇa, and when the mind is thus controlled he will experience actual fearlessness.