Bahá’í Sacred Writings, Bahá’u’lláh, #54

O My brother! A pure heart is as a mirror; cleanse it with the burnish of love and severance from all save God, that the true sun may shine therein and the eternal morning dawn. Then wilt thou clearly see the meaning of “Earth and heaven cannot contain Me; what can alone contain Me is the heart of him that believeth in Me.” And thou wilt take up thy life in thy hand and with infinite longing cast it before thy newly found Beloved.

Whensoever the light of the revelation of the King of Oneness settleth upon the throne of the heart and soul, His radiance becometh visible in every limb and member. At that time, the mystery of the famed tradition gleameth out of the darkness: “A servant is drawn unto Me in prayer until I answer him, and when I have answered him, I become the ear wherewith he heareth …” For thus the Master of the house hath appeared within His home, and all the pillars of the dwelling are ashine with His light. And as the action and effect of the light are from the Light-Giver, so it is that all move through Him and arise by His will.