Imam has explained the matter in his famous book “an exposition on Forty Hadith” as following
Today my eyes and yours are closed, and we do not possess any divine vision.
Our terrestrial eyes are unable to perceive, but when the hidden is revealed and the kingdom of heaven is manifested, the physical world vanishes and reality is disclosed; you will realize that you were not a believer in God, and your rational judgment was not congruous with your faith.
Unless the words,—there is no god except God— are inscribed on the tablet of the heart with the pen of reason, man is not a true believer in the Unity of God.
When this sacred and holy dictum is impressed on the heart, the domain of the heart turns by itself into the kingdom of God Almighty.
Then only man does not see anyone else as efficient in the realm of truth; he does not expect any rank, any distinction or riches from anybody else; he does not seek for honor and fame with the help of others; and his heart does not become hypocritical and profane.