Imam Khomeini warned against disregarding divine signs

In the Hereafter, whether it is in the Barzakh (an interval of time between the death of man and his resurrection) or whether on the Last Day, if one’s inner nature, his deeds, and his inner self are really human, his heavenly visage also will be man-like. But if his deeds are inhuman, he will not possess human form; it will be rather subject to the state of his inner self and his psyche, Imam explained. 

Imam Khomeini in his famous book of "Combat with the self" has undertaken very useful discussions in this regard as following:

For instance, if his inner self is dominated by the power of lust or sensuality (al-quwwah al-shahwiyyah) and animality and brutality overwhelm and govern his inner self, his otherworldly visage will be of a brute and the reign of his inner world would be under the control of one of the beasts, corresponding to that quality of his soul.

If the power of passion or anger conquers one’s inner self and his psyche, his otherworldly appearance will resemble one of the bestial forms, corresponding to that attribute of his nature.

And if the power of imagination and invention is governed by fiendish forces and his inner self is made vicious, governed by the vices like deceit, dishonesty, slandering, backbiting, which are the attributes of Satan, he may undergo a metamorphosis and assume one of the forms of Satan.

Sometimes it is also possible that he would have an appearance that symbolizes two or several vices. In that case, a form which does not resemble any of the brutes, but an unusual and queer form, with which cannot be compared the most terrible and ugliest monster in the world, will be acquired by him.

It has been recorded from the Prophet (S) of God that some persons will be raised on the Last Day in such a mien that even monkeys and dog flies will appear better looking than that. It is also possible that several forms may be prescribed for one individual in that world.

Because that world is not like this world, where one individual cannot acquire more than one form. This account itself is logical as well as self-evident. Because, the criterion of those different forms (of which human form is one) would be the state of soul at the time of death the state in which the soul departs from the body.

It is in this very state and form that man’s soul enters the realm of Barzakh. At the time of entering the other world, that is, the domain of the Hereafter, the first stage of which is Barzakh, in whichever state one’s soul departs from the body, it assumes a form suited to it in the next world also.

It is the same form in which he is perceived by the inhabitants of Barzakh and by himself, when he first opens his eyes there, if he has not lost his sight to do so. Because, it is not necessary that man may enter the next world in the same physical state as he had in this world, Imam highlighted.

God Himself says that on the Last Day some of the persons will ask God that why has He raised them as blind while they possessed eyes in the world.

God will answer them that as they disregarded His clear signs in the world, they are forgotten and disregarded by God today.