One verse

Bhagavad Gita 18.16

18.16

तत्रैवं सति कर्तारमात्मानं केवलं तु यः | पश्यत्यकृतबुद्धित्वान्न स पश्यति दुर्मतिः ||१८-१६||

tatraivaṃ sati kartāramātmānaṃ kevalaṃ tu yaḥ . paśyatyakṛtabuddhitvānna sa paśyati durmatiḥ ||18-16||

tatra
there
evam
thus
sati
being
kartāram
the worker
ātmānam
himself
kevalam
only
tu
but
yaḥ
anyone who
paśyati
sees
akṛta-buddhitvāt
due to unintelligence
na
never
saḥ
he
paśyati
sees
durmatiḥ
foolish

Therefore one who thinks himself the only doer, not considering the five factors, is certainly not very intelligent and cannot see things as they are.