From the Westminster Larger Catechism
Q. 12. What are the decrees of God?
A. God’s decrees are the wise, free, and holy acts of the counsel of his will, whereby, from all eternity, he hath, for his own glory, unchangeably foreordained whatsoever comes to pass in time, especially concerning angels and men.
Q. 13. What hath God especially decreed concerning angels and men?
A. God, by an eternal and immutable decree, out of his mere love, for the praise of his glorious grace, to be manifested in due time, hath elected some angels to glory; and in Christ hath chosen some men to eternal life, and the means thereof: and also, according to his sovereign power, and the unsearchable counsel of his own will (whereby he extendeth or withholdeth favor as he pleaseth), hath passed by and foreordained the rest to dishonor and wrath, to be for their sin inflicted, to the praise of the glory of his justice.
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Q. 20. What was the providence of God toward man in the estate in which he was created?
A. The providence of God toward man in the estate in which he was created, was the placing him in paradise, appointing him to dress it, giving him liberty to eat of the fruit of the earth; putting the creatures under his dominion, and ordaining marriage for his help; affording him communion with himself; instituting the Sabbath; entering into a covenant of life with him, upon condition of personal, perfect, and perpetual obedience, of which the tree of life was a pledge; and forbidding to eat of the tree of the knowledge of good and evil, upon the pain of death.
Q. 21. Did man continue in that estate wherein God at first created him?
A. Our first parents being left to the freedom of their own will, through the temptation of Satan, transgressed the commandment of God in eating the forbidden fruit; and thereby fell from the estate of innocency wherein they were created.
Q. 22. Did all mankind fall in that first transgression?
A. The covenant being made with Adam as a public person, not for himself only, but for his posterity, all mankind descending from him by ordinary generation, sinned in him, and fell with him in that first transgression.
Q. 23. Into what estate did the fall bring mankind?
A. The fall brought mankind into an estate of sin and misery.
Q. 24. What is sin?
A. Sin is any want of conformity unto, or transgression of, any law of God, given as a rule to the reasonable creature.
Q. 25. Wherein consisteth the sinfulness of that estate whereinto man fell?
A. The sinfulness of that estate whereinto man fell, consisteth in the guilt of Adam’s first sin, the want of that righteousness wherein he was created, and the corruption of his nature, whereby he is utterly indisposed, disabled, and made opposite unto all that is spiritually good, and wholly inclined to all evil, and that continually; which is commonly called original sin, and from which do proceed all actual transgressions.
Q. 26. How is original sin conveyed from our first parents unto their posterity?
A. Original sin is conveyed from our first parents unto their posterity by natural generation, so as all that proceed from them in that way are conceived and born in sin.
Q. 27. What misery did the fall bring upon mankind?
A. The fall brought upon mankind the loss of communion with God, his displeasure and curse; so as we are by nature children of wrath, bond slaves to Satan, and justly liable to all punishments in this world, and that which is to come.