Even in situations where external pressures (such as sickness, bereavement, abuse, abandonment etc.) come to bear on us, God holds us responsible for how our heart responds during the experience (e.g. anger towards God, harbouring fear etc.) and for how our heart responds after the experience (e.g. withdrawal, resentment, self-pity, greed etc.).
This battle for the heart is very practical. It means that we are not excused responsibility when something bad happens to us, but are held responsible for how we respond.
For example, a person may act angry or grumpy in response to lack of sleep. Even if the lack of sleep was external (e.g. side effect of a medication, a crying baby, inconsiderate neighbours etc.) God still holds us accountable for our heart response and any sin that occurs through that anger or grumpiness.
Pastoral dynamite! Read the whole thing at What you think matters