One verse

Srimad Bhagavatam 11.7.20

11.7.20

आत्मनो गुरुरात्मैव पुरुषस्य विशेषत: । यत् प्रत्यक्षानुमानाभ्यां श्रेयोऽसावनुविन्दते ॥ २० ॥

ātmano gurur ātmaiva puruṣasya viśeṣataḥ yat pratyakṣānumānābhyāṁ śreyo ’sāv anuvindate

ātmanaḥ
of himself
guruḥ
the instructing spiritual master
ātmā
himself
eva
indeed
puruṣasya
of a person
viśeṣataḥ
in a particular sense
yat
because
pratyakṣa
by his direct perception
anumānābhyām
and application of logic
śreyaḥ
real benefit
asau
he
anuvindate
can eventually gain

An intelligent person, expert in perceiving the world around him and in applying sound logic, can achieve real benefit through his own intelligence. Thus sometimes one acts as one’s own instructing spiritual master.