One verse

Srimad Bhagavatam 5.6.3

5.6.3

तथा चोक्तम्— न कुर्यात्कर्हिचित्सख्यं मनसि ह्यनवस्थिते । यद्विश्रम्भाच्चिराच्चीर्णं चस्कन्द तप ऐश्वरम् ॥ ३ ॥

tatha coktam—— na kuryat karhicit sakhyam manasi hy anavasthite yad-visrambhac cirac cirnam caskanda tapa aisvaram

tatha
so
ca
and
uktam
it is said
na
never
kuryat
should do
karhicit
at any time or with anyone
sakhyam
friendship
manasi
in the mind
hi
certainly
anavasthite
which is very restless
yat
in which
visrambhat
from placing too much faith
cirat
for a long time
cirnam
practiced
caskanda
became disturbed
tapah
the austerity
aisvaram
of great personalities like Lord Siva and the great sage Saubhari

All the learned scholars have given their opinion. The mind is by nature very restless, and one should not make friends with it. If we place full confidence in the mind, it may cheat us at any moment. Even Lord Siva became agitated upon seeing the Mohini form of Lord Krsna, and Saubhari Muni also fell down from the mature stage of yogic perfection.