Spirit, Conscience and Soul
We are already aware of the two aspects of the soul: the one inspiring evil, and wicked deeds, and the other guarding against every inculcation of evil. The latter guides man to righteousness, as explained in the Qur’an. Allah breathed into him something of His spirit; this is the spirit, the conscience.
In Surat As-Sajda, Allah informs us about this:
He Who has made everything which He has created most good: He began the creation of man with (nothing more than) clay, and made his progeny from a quintessence of the nature of a fluid despised: But He fashioned him in due proportion, and breathed into him something of His spirit. And He gave you (the faculties of) hearing and sight and feeling (and understanding): little thanks do you give! (As-Sajda, 7-9)
As long as the individual follows the voice of his conscience, he will be like a model displaying the attributes of Allah in his personality.
Man's concience is in compliance with all the commandments of Allah. Two verses in the Surat Ar-Rum are quite explanatory:
No, the wrong-doers (merely) follow their own lusts, being devoid of knowledge. But who will guide those whom Allah leaves astray? For them there will be no helpers.
According to the verses, unbelievers go astray by following their own lusts.What believers, on the other hand, must do is to follow the religion Allah communicates to man through revelation. This religion offers a life style which is most suitable tho the nature of man and his conscience, that is, to the spirit Allah has breathed into him.