here is some information on the human nature
Physical and biological nature of man is, although, not the main concern of the Holy Qur’an, it does provide significant insight about man and his nature. A brief description of Islamic thought on the subject is mentioned below:

Islam does not presuppose any inherent wickedness of human nature. Any negative representation of man’s basic nature as a source of evil and wickedness is clearly rejected. According to Islam, the human being is born in the state of fitrah, the original inherent nature of the human being. At birth, the baby is totally innocent and is not responsible for the sin of his parents or any of his ancestors. Environmental and other external influences keep on modifying his blueprint. The Holy Prophet (PBUH) said:

“Every child is created in the state of fitrah, it is the parents, culture, and society that make him a Christian, a Jew, or a fire-worshipper.”

Islam is the first religion to declare man as the most superior of the creatures and the masterpiece of the Creator. According to Islam, man is potentially capable of rising higher than the angels, that is why Allah has commanded angels to bow down before Adam. But, at the same time, he is equally capable of sinking lower than the animals. The Holy Qur’an says:

"We have indeed created man in the best shap, then We reduced him (to be) the lowest of the low, except those who believe and do righteous deeds: for they shall have a reward unfailing." (95:4­6)

These verses indicate that Allah has given man the purest and best nature while man’s duty is to preserve the pattern on which God has made him. However, when he neglects his duty and goes in the wrong way, he will be reduced to the lowest possible position.

The Holy Qur’an asserts that inclination and attraction towards faith and virtue and repulsion from disobedience and corruption exists in man’s nature.

“But God has endeared to you faith and has beautified it in your hearts and has made disbelief and lewdness and rebellion hateful to you.” (49:7)

To sum up the point, man comes into the world with a pure and wholesome nature. Whereas sin and corruption in human being are merely accidental and violation of his original nature. The role of prophets and the scriptures is just to help human nature to flow in its true channel and to guide human nature to its ultimate goal of eternal felicity. This Qur’anic theory of human nature also implies the fact that if man consciously decides to submit himself to the will of Allah, he experiences no conflict in his personality. (10:62) while, on the other hand, if he misuses his freedom of choice by denying God and not submitting to His will, would be in a state of inner conflict and his personality gets disintegrated.

for more information
http://science-islam.net/article.php3?id_article=458&lang=en