One verse

Srimad Bhagavatam 3.26.14

3.26.14

मनो बुद्धिरहङ्कारश्चित्तमित्यन्तरात्मकम् । चतुर्धा लक्ष्यते भेदो वृत्त्या लक्षणरूपया ॥ १४ ॥

mano buddhir ahankaras cittam ity antar-atmakam caturdha laksyate bhedo vrttya laksana-rupaya

manah
the mind
buddhih
intelligence
ahankarah
ego
cittam
consciousness
iti
thus
antah-atmakam
the internal, subtle senses
catuh-dha
having four aspects
laksyate
is observed
bhedah
the distinction
vrttya
by their functions
laksana-rupaya
representing different characteristics.

The internal, subtle senses are experienced as having four aspects, in the shape of mind, intelligence, ego and contaminated consciousness. Distinctions between them can be made only by different functions, since they represent different characteristics.