Can we be guilty for sinful responses that seem to erupt in us automatically? Can we really consider sin voluntary if it is not consciously chosen? Consider the following illustration of how unintentional sin works:

Trained instincts—that's how fighter pilots can react immediately to rapidly changing situations as they operate $27 million war machines. When a threat aircraft is closing in, there's no time for pilots to reason through what to do. They have to rely on instinct—but not just natural instinct. They need instincts shaped deep within then through years of regiment. The countless little decisions they make in the cockpit are automatic, but that doesn't mean they're involuntary. The pilot voluntarily trained for them, and in the cockpit he reaps the instinctive benefits of that training.

Like the fighter pilot's hours of training, our hearts are under a regimen of beliefs and values that don't align with Scripture, drilled into us through what we put in our heads, what we receive as wisdom from other sources, what we accept as normal from culture. All of these shape our unintentional sin.