As Sproul has pointed out, Adam's fall is problematic for Calvinists (and also for Arminians, but for different reasons). The key problem is that Calvinism teaches that any person not acting from external force can only will to do what is in his nature to do. Which (apparently) means that Adam's nature must have contained some kind of sinful impulse.
There are at least three theories that attempt to solve this problem. (I suspect that there are a lot more than three, but these are the ones I'm acquainted with.)
1) The Deceit/Trespass theory. This says that Adam honestly believed he was doing God's will when he ate the fruit. His feeble but innocent mind wasn't capable of resisting the serpent's arguments, and he thought (again, innocently) that God was testing him by telling him not to eat the fruit, that God actually did want him to eat the fruit, and that God was using the test to see if Adam deserved to be elevated to God's company of glorified beings. Adam's act of disobedience was thus a mere trespass and not an actual sin (which comes from a sinful impulse, an impulse Adam didn't have), but God treated the trespass as a sin and punished Adam with the loss of innocence. (An example of a trespass that's not a sin: God tells a man not to eat broccoli on Tuesday. The man honestly thinks today is Wednesday when it's actually Tuesday, and he eats the broccoli with a perfectly clear conscience.)
2) The Shelf-Life theory: This says that God created Adam with a nature in which all the impulses were of proper size and in perfect proportion. Adam's self-love was very narrowly constrained. But like a candle that slowly burns down to the wick (Dabney's metaphor), Adam's nature eventually ran out of the store of grace it was created with. When the store of grace had been depleted, Adam's self-love grew monstrously out of balance and gave Adam the sinful impulse that led him to eat the fruit.
3) The Tragedy of the Creature theory: This says that by logical necessity, all creatures, not being the source of their own existence, must be flawed. Therefore Adam had to have been created with a sinful impulse of some kind.
The problem with the first theory is that a mere trespass isn't a real sin. The problem with the second is that God ends up being the reason Adam sinned, God having created Adam with a sinful impulse, even if it was one that wouldn't appear until some time had passed. The problem with the third theory is that while God has nothing to answer for here, God not being capable of creating a being truly free of a sinful nature, Adam has nothing to answer for, either, having been created with the impulse to sin.
I prefer Sproul's approach to the problem, which is to understand that not all problems allow for human solutions. But I'm wondering if anyone else has some thoughts to add?
There are at least three theories that attempt to solve this problem. (I suspect that there are a lot more than three, but these are the ones I'm acquainted with.)
1) The Deceit/Trespass theory. This says that Adam honestly believed he was doing God's will when he ate the fruit. His feeble but innocent mind wasn't capable of resisting the serpent's arguments, and he thought (again, innocently) that God was testing him by telling him not to eat the fruit, that God actually did want him to eat the fruit, and that God was using the test to see if Adam deserved to be elevated to God's company of glorified beings. Adam's act of disobedience was thus a mere trespass and not an actual sin (which comes from a sinful impulse, an impulse Adam didn't have), but God treated the trespass as a sin and punished Adam with the loss of innocence. (An example of a trespass that's not a sin: God tells a man not to eat broccoli on Tuesday. The man honestly thinks today is Wednesday when it's actually Tuesday, and he eats the broccoli with a perfectly clear conscience.)
2) The Shelf-Life theory: This says that God created Adam with a nature in which all the impulses were of proper size and in perfect proportion. Adam's self-love was very narrowly constrained. But like a candle that slowly burns down to the wick (Dabney's metaphor), Adam's nature eventually ran out of the store of grace it was created with. When the store of grace had been depleted, Adam's self-love grew monstrously out of balance and gave Adam the sinful impulse that led him to eat the fruit.
3) The Tragedy of the Creature theory: This says that by logical necessity, all creatures, not being the source of their own existence, must be flawed. Therefore Adam had to have been created with a sinful impulse of some kind.
The problem with the first theory is that a mere trespass isn't a real sin. The problem with the second is that God ends up being the reason Adam sinned, God having created Adam with a sinful impulse, even if it was one that wouldn't appear until some time had passed. The problem with the third theory is that while God has nothing to answer for here, God not being capable of creating a being truly free of a sinful nature, Adam has nothing to answer for, either, having been created with the impulse to sin.
I prefer Sproul's approach to the problem, which is to understand that not all problems allow for human solutions. But I'm wondering if anyone else has some thoughts to add?