In the Holy Qur'an

Do they not reflect within themselves? (30:8)

Certainly We created man in the best make (95:4)

In the Traditions

The Prophet said, "Whoever knows himself knows his Lord"

Imam Ali said,

"Your sickness is within you, though you do not realise
And your cure is within, yet you do not see
Your claim that you are nothing but a tiny entity
Yet wrapped up inside of you is the greatest universe
You are the clear book, through whose letters
All that is secret is revealed and made know.
So you have no need for anything outside of you
Your consciousness is within you, though you do not know."