O my brother! Take thou the step of the spirit, so that, swift as the twinkling of an eye, thou mayest flash through the wilds of remoteness and bereavement, attain the Riḍván of everlasting reunion, and in one breath commune with the heavenly Spirits. For with human feet thou canst never hope to traverse these immeasurable distances, nor attain thy goal.
—Bahá’u’lláh, The Kitáb-i-Íqán
