Mirza Mihdi was taken to Baghdad to join the Family in the
year AH 1276 (circa AD 1860). It was in that city that this pure and holy
youth, noted for his meekness, came in touch with the Divine Spirit and was
magnetized by the energizing forces of Bahá'u'lláh's Revelation. From that time
on, he devoted every moment of his life to the service of his heavenly Father.
He was Bahá'u'lláh's companion in Baghdad, Adrianople and 'Akká, and served Him
as an amanuensis [It must be noted that although Mirza Aqa Jan was
Bahá'u'lláh's amanuensis, there were also others who were engaged in this task
from time to time] towards the end of his life, leaving to posterity some
Tablets in his handwriting. The last ten years of his life were filled with the
hardship and suffering inflicted on Bahá'u'lláh and His companions in the
course of the three successive banishments from Baghdad to 'Akká.
The Purest Branch resembled 'Abdu'l-Bahá, and throughout his
short and eventful life he displayed the same spiritual qualities which
distinguished his illustrious Brother. The believers loved and venerated him as
they did 'Abdu'l-Bahá.
- Adib Taherzadeh ('The Revelation of Baha'u'llah, vol. 3')