1 story on this theme.
In the years of His exile in Baghdád, Bahá'u'lláh received a letter of spiritual questions from a Ṣúfí leader, a judge named Shaykh Muḥyi'd-Dín. In answer He revealed the Seven Valleys — a mystical Tablet that traces the soul's ascent to God through seven stages, from the first Valley of Search to the last Valley of true poverty and nothingness. A single revealed letter became one of the most beloved descriptions of the inner journey ever written.