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Shiavault - a Vault of Shia Islamic Books Pretension and Conceit Explaning How Conviction Is Not Knowledge Then Imam al-Khomeini, may Allah prolong his shade, explained that conviction is not synonymous with knowledge.
He said: Be informed that conviction is not the same as knowfedge about Allah, knowfedge about His Unity, about the rest of His fixed attributes of perfection and great negative ones, knowledge about the angefs, the books, the messengers and the Last Day, for perhaps one may be knowledgeable about aif these matters without being a befiever.
Satan, too, knows about these levels of knowledge as much as I know, and as much as you know, yet he is He also believes in the principle and knows that Alfah is the Creator because he says, "You created me of fire and created him of dust." And he knows about the Hereafter, too, because he says, "Grant me a respite till the Day that they are brought back to fife." Yet, despite all these qualities, he is kafir according to the clear Qur'anic verse that says, "...
and he was among the unbefievers." The secret in this is that conviction is an act of the heart. If it is not brought into being, there is no presence for conviction. If anyone gets to know something according to the dictates of the rational evidence, or according to the judgment necessitated by the creed, the heart has to surrender to such knowledge, so the action conies from the heart as a manifestation of such surrendering and submission, a sort of acceptance, so he may be a befiever.
One's perfection is feeling comfortable (with such surrendering) as referred to by this sacred verse: "'Then do You not befieve?' He said, 'Yes, I do! But so that my own understanding may be satisfied" (Qur'an, 2:260). When the light of conviction in the heart is strong, it is followed by feeling comfortable with it. All of this is different from knowledge. Our minds can reafize something through evidence, but our hearts did not surrender to it. Thus, know ledge becomes useless.
For example if you realize through your mind that a dead person cannot harm anyone, even if all the dead in the world get together, they coflectively have neither sense nor motion in as much as a mosquito, and that alf the physical and spiritual forces have already departed.