According to rahyafte (the missionaries and converts website):
Amir al-Mu’minin Ali PBUH:
.With Our Mahdī (s appearance), all proofs would be broken; for he is the last Imam, the savior of the Ummah, and the highest point of light, and has a recondite secret.
(Sea of Lights, Volume 77, Page 300)
source:#Thepromesidsaviour
