Adam would be a great place to start, being a pure man created by God that God looked upon and said, "IT is very good!."
Can we assume that Adam was born with perfect and good propensities without the slightest evil or sin in his nature? I would certainly think so. I would believe his natural propensities on a spiritual level were perfect, giving Adam the necessary abilities to love and to serve God. I would believe his physical propensities were perfect in that no given propensity was so strong or inclined to ruin the temple of God by force or coercion of his will. There was not even a hint of sin within him, being made so pure God called His creation "very good."
What do you think? Have any other ideas to his natural propensities or inclinations he was created with?
The term "lust" does not convey good or bad as the good or bad application is determined by the context in which the word "lust" is found. The same term describes objects of lust that are good and holy.
The term "lust" simply means "desire" and all rational creatures have ability to "desire" because "desire" is merely the driving motive behind all acts of choice. If a creature is capable of choice it is because they are capable of desire as desire is foundational for choice to exist. Your choice is determined by the precedent of desire and desire is produced in the heart (mind/feelings) in response to something that provides appeal to your mind and heart (temptations). Hence, the interaction of temptation with your heart produces desires which in turn motivate a choice. Choice is merely the manifest expression of desires originating in your heart (mind/intellect) in response to a given temptation.
In regard to pre-fallen Adam or any other pre-fallen created being that is capable of choice, in particular moral choices, sin is conceived in the heart when the heart (mind/intellect) not merely entertains/considers an external temptation that is by definition wrong, but consideration yeilds to desire that is in turn is manifested by choice to obtain what has been embraced in the heart (mind/feelings).
How is sin conceived in a pre-fallen Adam versus a post-fallen Adam? In the pre-fallen Adam sin has no existence in the heart from the origin of Adam as Adam was created "upright" and therefore without an internal existence of sin. Therefore, for sin to be conceived in the heart of a pre-fallen Adam it requires an EXTERNAL temptation to be brought into the heart for consideration. After that point there is no difference.
However, the post-fallen Adam needs no external temptation to bring sin into the heart for consideration but sin already exists in the heart of the Post-fallen Adam and his posterity from birth. The Post-fallen Adam is separated from God and his heart is dominated by sin that Pre-fallen Adam gave permission to enter and indwell him. This is clearly spelled out by Paul in Romans 7:14-20 in regard to the "flesh." Hence, he is in double jepordy from within and without. This same description in Romans 7:14-20 is not merely true of the Post-fallen Adam but is true of all his posertity from birth. No rational decision is necessary for post-fallen posterity of Adam to allow sin into their hearts because it was by the representative OFFENCE by ONE MAN that all were made sinners by nature from birth with sin already indwelling their heart.
Babies do not have an innocent heart. They manifest the influence of indwelling sin even before they can reason or talk.
The prefallen Adam possessed a heart free from sin but not so with the Post-fallen Adam and his posterity. The will is not capable of expressing any choice that is not produced as a desire by the heart (mind/feelings) because the will gives only expression of what is INSIDE man. The heart INSIDE man is dominated by sin and therefore so are all his motives/desires and the will does not operate distinct and indepdent from what HE IS according to His heart.
Every deed is judged by its motive! The only right biblical motive is to do all things for the glory of God - the fallen man has a heart incapable of doing anything for the glory of God and therefore everything he does is sin - not good in God's sight.
Free will is the author of sin in Adam bringing sin INTO man's heart to dwell, whereas, in the fallen Adam and his poserterity indwelling sin in the heart is the author of sin and the will is merely the servant of an evil heart that expresses the desires of the heart.
The will of man in Adam was FREE from indwelling sin but it was that very FREEDOM by brought sin into the heart and robbed that freedom from the will.
Before the fall the heart of Adam was "upright" and therefore FREE from indwelling sin and the will FREE from any internal influence by sin.
After the fall the heart of Adam was NOT "upright" and therefore NOT FREE from indwelling sin and therefore the will is NOT FREE from any internal influence of sin.
The will cannot express anything EXTERNAL to himself. The will simply expresses INTERNAL desires and the fallen man's heart is under the influence of sin and is wicked and has NO DESIRES that by motive glorify God and so ALL HIS DESIRES are sinful and the WILL is only FREE to express such desires as there are no other desires resident in fallen man.
Hence, Before the Fall there was FREE will but after the fall the only freedom the will possesses is the freedom to express the sinful desires of the human heart. This is the BONDAGE OF SIN.