ज्यों नैनो में पुतली

ज्यों नैनो में पुतली , त्यों मालिक घट माहि | मूरख लोग ना जानिहि बहिर ढूँढ़न जाहि||

As the pupil inside the eyes,so is the God inside my pot(body); Fools do not know this and go looking outside for Him

Kabir uses the similarity of construction of the pupil inside the eyeball with the Seer(God) inside the Pot representing the body, to drive home his message.Also as we see that the pupil is the seer of all that is outside, through the physical eye, similarly the Absolute seer sees with the help of the body, physical and subtle. Those who try to look with the physical eye , go looking for Him outside whereas those who look for Him inside through the mind's eye can find Him.

The Absolute Consciousness is the one that sees.All that we have to work towards is the removal of the five types of modifications in the mind which act like dirt and dust on the mind's mirror.Once that dust is removed , the vision becomes clear and consequently the seer rests back in its own original nature.This is called Realization of God.
तदा द्रष्टुः स्वरूपे अवस्थानम् II---yogasutra of patanjali

Translation by Arvind Mishra