One verse

Srimad Bhagavatam 11.14.28

11.14.28

तस्मादसदभिध्यानं यथा स्वप्नमनोरथम् । हित्वा मयि समाधत्स्व मनो मद्भ‍ावभावितम् ॥ २८ ॥

tasmād asad-abhidhyānaṁ yathā svapna-manoratham hitvā mayi samādhatsva mano mad-bhāva-bhāvitam

tasmāt
therefore
asat
material
abhidhyānam
processes of elevation which absorb one’s attention
yathā
just as
svapna
in a dream
manaḥ-ratham
mental concoction
hitvā
giving up
mayi
in Me
samādhatsva
completely absorb
manaḥ
the mind
mat-bhāva
by consciousness of Me
bhāvitam
purified

Therefore, one should reject all material processes of elevation, which are like the mental creations of a dream, and should completely absorb one’s mind in Me. By constantly thinking of Me, one becomes purified.