One verse

Srimad Bhagavatam 11.3.40

11.3.40

यर्ह्यब्जनाभचरणैषणयोरुभक्त्या चेतोमलानि विधमेद् गुणकर्मजानि । तस्मिन् विशुद्ध उपलभ्यत आत्मतत्त्वं साक्षाद् यथामलद‍ृशो: सवितृप्रकाश: ॥ ४० ॥

yarhy abja-nābha-caraṇaiṣaṇayoru-bhaktyā ceto-malāni vidhamed guṇa-karma-jāni tasmin viśuddha upalabhyata ātma-tattvaṁ śākṣād yathāmala-dṛśoḥ savitṛ-prakāśaḥ

yarhi
when
abja-nābha
of the Supreme Personality of Godhead, whose navel is shaped like a lotus
caraṇa
the feet
eṣaṇayā
desiring (only)
uru-bhaktyā
by powerful devotional service
cetaḥ
of the heart
malāni
the dirt
vidhamet
cleanses away
guṇa-karma-jāni
generated from the modes of nature and material activities in those modes
tasmin
in that
viśuddhe
completely purified (heart)
upalabhyate
is perceived
ātma-tattvam
the true nature of the self
sākṣāt
directly
yathā
just as
amala-dṛśoḥ
of pure eyes
savitṛ
of the sun
prakāśaḥ
the manifestation

When one seriously engages in the devotional service of the Personality of Godhead, fixing the Lord’s lotus feet within one’s heart as the only goal of life, one can destroy the innumerable impure desires lodged within the heart as a result of one’s previous fruitive work within the three modes of material nature. When the heart is thus purified one can directly perceive both the Supreme Lord and one’s self as transcendental entities. Thus one becomes perfect in spiritual understanding through direct experience, just as one can directly experience the sunshine through normal, healthy vision.