The great guide Ismail Haqqi al-Burusawi describes the savage climate in the time of Hazrat Mahdi (as) and Hazrat Mahdi's (as) profound knowledge

... it is therefore revealed in the Qur’an that: “He responds to the oppressed when they call on Him…” (Surat an-Naml, 62) The reference is a declaration of acceptance of prayers by Allah when the time of necessity comes. And it is for these reasons that in every century a person has appeared to fully eliminate all fierce calamity. AND HAZRAT MAHDI (AS) NEEDS TO APPEAR SINCE THE STRIFE IN THE WORLD INCREASES IMMENSELY. THE POWER OF THE DOCTOR IS PROPORTIONATE TO THE STRENGTH OF THE DISEASE, AFFLICTION, TROUBLE OR SCOURGE. AND THOSE WHO ARE PRESENT AT THE TIME WILL KNOW THE FULL SCALE OF THE DISEASE, AFFLICTION, TROUBLE AND SCOURGE AFFLICTING THE WORLD IN THE END TIMES... (Ismail Haqqi al-Burusawi, Commentary of Mathnawi, p. 250)

In his Commentary of Mathnawi, Ismail Haqqi al-Burusawi, one of the greatest spiritual guides of the 17th century, draws particular attention to the End Times and to Hazrat Mahdi (as) who will appear in the End Times.
Burusawi states that the time when Hazrat Mahdi (as) appears will be full of disorder and that he will appear at a time of intense and severe physical and spiritual sickness. In addition, his reference to THE POWER OF THE DOCTOR IS PROPORTIONATE TO THE STRENGTH OF THE DISEASE, AFFLICTION, TROUBLE OR SCOURGE suggests that Hazrat Mahdi (as) will possess great knowledge, bestowed by Allah, that will represent a complete cure to this spiritual sickness and intense disorder, the like of which have never been seen before. In addition, Burusawi indicates that this time had not yet come in his own day, the 17th century, in the words, ”THOSE WHO ARE PRESENT AT THE TIME WILL KNOW THE FULL SCALE OF THE DISEASE, AFFLICTION, TROUBLE AND SCOURGE AFFLICTING THE WORLD IN THE END TIMES...”