Imam in his famous book of "an exposition on Forty Hadith" sheds the light on the matter as following:
Whatever has been related about the paradise of good morals and deeds and about the inferno of bad morals and deeds refers to the states, which we cannot experience here. Thus, my friend ! take great care, search for remedy, and try to discover the ways and means of deliverance for yourself.
Seek refuge in God, the Most Merciful, and Beneficent, and beseech His mercy with humble supplications and lamentation, so that He may help you in this holy war against your carnal self and you may be victorious and the domain of your heart may be liberated from evil influences, Imam pointed out.
The fiendish legions may be turned out of the place so that it may be given in the possession of its rightful Owner, and the felicities, honors and joys may be granted to you by God. All the praises that you have heard of the Heaven, its hours and its mansions, are nothing compared to Divine Bliss, nothing can be estimated higher.
That domain is absolutely a divine sphere, which has been described by the friends of God from this rightly guided luminous ummah (millat al-bayda). This is a world of pleasures, which no ear has ever heard of, and no human heart has ever experienced.
There is a subtle allusion also to the heaven and hell of morality, which is more significant than even the Bihisht al-liqa, the heaven of beatific vision, and the Jahannam al-firaq, the hell of separation from Him.
This is considered to be of great significance but is hidden from our eyes and is opened to them alone who deserve it. You and me who do not deserve it should not doubt it. We should have faith in it, since God and His friends have told us that this non-detailed (ijmali) faith also is beneficial for us.
Sometimes, it is also possible that unbelief arising out of ignorance, and unreasonable rejection, without any knowledge and understanding of the truth may bring great harm to us, the extent of which is unthinkable. In this world we cannot understand those harms, Imam further explained.
If you hear something, which has been, reported from any thinker, mystic or ascetic, do not refute it or consider it invalid just because it is not in accordance with your taste, or does not fit in your mode of thinking. This idea may have its origin in a higher source, inaccessible to you like the Qur’an, hadith, or reason.
How strange it will be that a faqih issues a fatwa (a religious or legal opinion) regarding a certain ayah (a pecuniary compensation for any offence against a person) of which you are ignorant, and you reject it without checking the relevant evidences. Or, when a holy person or a mystic speaks something concerning religious learning, or he refers to the conditions of heaven or hell, it is easy for you to refute him or even dare to insult him. For it does not need much thinking or knowledge.
But do not forget that it is possible that the person, who is an authority on that subject and a master in that field, might have traced it back to the Holy Book, or has access to some traditions transmitted from infallible Imams (AS), and you may not have come across it.
In that case, you would be guilty of rejecting God and His Prophet (S) without any plausible excuse. You have no justification to say later that your judgment was not correct, your knowledge was limited, or that you had heard a certain person speaking otherwise on the minbar (pulpit); such excuses are unfounded, and in any case let not your objective be blurred.
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