Bhagavatapurana 11.2.38

11.2.38

avidyamāno 'py avabhāti hi dvayo dhyātur dhiyā svapna-manorathau yathā /
tat karma-saṅkalpa-vikalpakaṃ mano budho nirundhyād abhayaṃ tataḥ syāt //

38. Though it does not exist in reality, the world of differences like dreams and fancies, seems to be, on account of the mind of the man that thinks of it. Therefore the wiseman should control the mind which by its thoughts institutes the existence and the difference of things.