Among all unregenerate mankind there is a desire burning within – desiring to be quenched or satisfied. As we've stated earlier, God's innate desire is as a giver, a lover, a self-for-others. Man was created "upright" (Eccl 7:29), having that same innate desire, that is before Adam's fall. Then Adam's self-being became transmuted into a self-for self, a self-getter, and a manipulating taker, a trait we see in all men today, from their birth. By Adam's fall in the garden, mankind became a twisted self. The image of God, the one who flows outward, was within man's capacity, but it had become distorted and turned inward, becoming self-love and self-serving.

Note that when I refer to man's "capacity" I do not mean to say that a man has a self-nature to express. I only mean man was created with the soul organs capable of giving expression to a nature – man was created ready to receive a nature and manifest that nature. Man was created as a perfect, upright, clean vessel capable of giving expression to a nature; but he in his own self was nature-less. Man was created ready to receive a spiritual guiding nature. Man (Adam) was as a car without a driver. Man in his own self only has the capacity to be an expresser of another superior (spirit) life in him. The first superior spirit that entered man, and to whom man became subservient, was the Serpent (also called, the Evil One Lucifer, Devil, Satan, and the Dragon). Sin, as a nature, came into and abides in the flesh of all mankind.

Romans 5:12 Wherefore, as by one man sin entered into the world …

Romans 7:23 But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.

Like it or not, all mankind since that time has the Sin infection – the fallen nature of the Evil one.

From the time of the Adam's fall, mankind possesses a restraining voice within; this by a co-perception that is of God – speaking into man's soul mind via man's human spirit. That co-perception is what the New Testament calls the conscience. This voice of conscience is likely to be contrary to the voice of the Evil One in man's flesh and who speaks into man's soul/mind. Though the Evil One had implanted his nature in man's body and usurped man's soul, man also had the voice of conscience by which God speaks to every man – saved or not. Romans 2:15 Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another.  The conscience, a faculty of man's human spirit, may be likened to an antenna, by which man may hear the Lord. The conscience of the human spirit of all men is as a Trojan horse in man. By it God speaks within man to convict man of His impoverished and helpless condition, and therefore his need of a righteous life and nature to replace the fallen nature that has usurped and corrupted mankind.

Man had been created in the image of God and intended by God to become be as God is, a lover of others; but by the fall and addition of the Sin nature, man has become a twisted in his love capacity – fallen man is now a self-loving self-for-self. Fallen man's random acts of good toward others are mostly to satisfy the lust of his self-loving nature, so as to look good and or to gain the praise and admonition of others.

Whereas mankind has fallen to a state of self-for-self that is self-loving and only full of self-concern, God is the opposite as a lover of others, a self-for others.

Now in the believer who has received Christ, two kinds of self exist;

1) Man has a false self by the usurpation of the Sin nature in man's flesh that expresses the self-for-self that is self-loving.

2) The believer has the self-for-others nature of God within by the indwelling "the Spirit of Life in Christ Jesus."

So there are two "contrary" natures in the believer – each "desiring" the opposite of the other.

Gal 5:17 For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.

Thankfully, we as believers have been set free from the power of Sin and can choose to live by "the Spirit of life in Christ Jesus."

Galatians 5:25 (NIV) Since we live (have life) by the Spirit, let us keep in step with the Spirit.