After the arrival of the blessed Black Banners of the East, Imam Ahmad Al-Hassan (fhip) came forth to reveal the secrets of Allah (SWT) which the minds have been confused about since the beginning of creation.
The matter of the Return (Raja’a) of Prophet Muhammad (pbuhahf) and the Imams (pbut) has long been considered a great secret. Comprehending and understanding this esoteric subject was hard and heavy until its companion, Imam Ahmad Al-Hassan (fhip), solved this mystery.
It was difficult to make sense or harmonise between the different narrations including those about the Raja’a, the Mahdis, the Imams, and the Holy Rise of the Qa’im (fhip). That is to be expected, because those four matters have an important and strong connection to the secret divine plan for the establishment of the Divine Just State. So surely, not anyone would have access to the knowledge that connects all the narrations together, except its real companion.
Aba Abdillah (pbuh) said: “Our matter is the truth, and the truth of the truth, and it is the apparent, and the inner of the inner, and it is the secret, and the secret of the secret, and the hidden secret and a secret covered with the secret.”
–Bihar Al-Anwar, Muhammad Baqir Al-Majlisi, 3rd ed., v.2, p.71, hadith 33