Our Imams were prohibited and they (a.s.) could not present the truth the way they wished. This also triggers great regret. Regret over this is more serious than the former. What kind of knowledge was it when the holy Prophet (s.a.) confided in the Commander of the Faithful in his last tether? The Commander of the Faithful (a.s.) has been quoted as saying, “Thousand doors of knowledge were open to me.” This knowledge is not the ordinary knowledge acquired by fuqaha, philosophers, mystics and us. What knowledge has it been that the Commander of the Faithful says, “I have genuine knowledge.” He has not been simply the bearer of knowledge.
It has not been the discipline of fiqh. The science of fiqh was taught later. It was not also that philosophy and other sciences that we have acquired. What is regrettable is that they were not given respite. At that time there was not the bearer they wanted. That science ascended to heaven along with them. We should regret to the end of the world for not taking any share of it. He was beyond the formal sciences acquired by man and Muslims, who are simply bearers of knowledge. Those who were not merely a bearer were the immaculate Imams and we should only regret that they did not find anyone to teach that knowledge. They did not find the opportunity to interpret the Qur'an that is the repository of all sciences, not being given the respite to explain the disciplines abounding in the Qur'an. These are the regrets that we have to take with us to the grave.
Sahifeh, vol. 19, Pages. 6- 7
Speech