“…greed and envy becloudeth the radiance of the soul even as the clouds obstruct the light of the sun.” -- Baha'u'llah explains

O children of understanding! If the eyelid, however delicate, can deprive man’s outer eye from beholding the world and all that is therein, consider then what would be wrought if the veil of covetousness were to descend upon his inner eye. Say: O people! The darkness of greed and envy becloudeth the radiance of the soul even as the clouds obstruct the light of the sun. Should anyone hearken unto this utterance with a discerning ear, he will unfurl the wings of detachment and soar effortlessly in the atmosphere of true understanding. (Baha’u’llah, ‘The Tabernacle of Unity, Bahá’u’lláh’s Responses to Mánikchí Sáhib and Other Writings’)