Heart

All that is in heaven and earth I have ordained for thee, except the human heart, which I have made the habitation of My beauty and glory; yet thou didst give My home and dwelling to another than Me; and whenever the manifestation of My holiness sought His own abode, a stranger found He there, and, homeless, hastened unto the sanctuary of the Beloved. Notwithstanding I have concealed thy secret and desired not thy shame.

Bahá’u’lláh, The Persian Hidden Words 27

Ignite, then, within their hearts the torch of Thy love, that its flame may consume all else except their wondrous remembrance of Thee, and that no trace may be left in those hearts except the gem-like evidences of Thy most holy sovereignty, so that from the land wherein they dwell no voice may be heard except the voice that extolleth Thy mercifulness and might, that on the earth on which they walk no light may shine except the light of Thy beauty, and that within every soul naught may be discovered except the revelation of Thy countenance and the tokens of Thy glory, that haply Thy servants may show forth only that which shall please Thee and shall conform wholly unto Thy most potent will.

Bahá’u’lláh, Prayers and Meditations by Bahá’u’lláh, p. 89-90

It followeth, therefore, that rendering assistance unto God, in this day, doth not and shall never consist in contending or disputing with any soul; nay rather, what is preferable in the sight of God is that the cities of men's hearts, which are ruled by the hosts of self and passion, should be subdued by the sword of utterance, of wisdom and of understanding. Thus, whoso seeketh to assist God must, before all else, conquer, with the sword of inner meaning and explanation, the city of his own heart and guard it from the remembrance of all save God, and only then set out to subdue the cities of the hearts of others.

Bahá’u’lláh, The Summons of the Lord of Hosts, p. 109-110

Out of the whole world He hath chosen for Himself the hearts of men -- hearts which the hosts of revelation and of utterance can subdue.

Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 279

Ponder awhile. Hast thou ever heard that friend and foe should abide in one heart? Cast out then the stranger, that the Friend may enter His home.

Bahá’u’lláh, The Persian Hidden Words 26

The things He hath reserved for Himself are the cities of men's hearts, that He may cleanse them from all earthly defilements, and enable them to draw nigh unto the hallowed Spot which the hands of the infidel can never profane. Open, O people, the city of the human heart with the key of your utterance. Thus have We, according to a pre-ordained measure, prescribed unto you your duty.

Bahá’u’lláh, Gleanings from the Writings of Bahá’u’lláh, p. 303