Original sin is the total spiritual corruption of human nature, which we have inherited from Adam through our parents. Because of original sin people have lost the righteousness, which God gave them at creation. A person, corrupted by original sin, does not actually fear or love God and does not trust solely in Him, but is spiritually dead and blind, an enemy of God and full of evil, with a desire for it.
Joh. 3:6: That which is born of the flesh is flesh.
Rom. 7:18: I know that in me (that is, in my flesh) dwelleth no good thing.
Rom. 8:7: The carnal mind is enmity against God.
Note: With the word flesh, when it is used in this context, the Bible means a person, as he by nature is conceived and born, who is therefore corrupted by original sin and without the Holy Spirit (the old man or old Adam).
Ps. 51:5 Behold, I was shapen in iniquity, and in sin did my mother conceive me.
Gen. 8:21: The imagination of man’s heart is evil from his youth.
Gen. 6:5: God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
1 Cor. 2:14: The natural man receiveth not the things of the Spirit of God, for they are foolishness unto him.
Eph. 2:1: You... were dead in trespasses and sins.
