We always act from the abundance of our hearts. If we respond to any situation with anger, it is what fills our hearts. If we respond with lust, it is what fills our hearts.
We can through all sorts of behavior modification, and it won't do any good, because in times of stress, we will revert to the overflow of our hearts.
I don't think it affects our eternal standing with God. Our standing is based on God's promise. We give him our allegiance, and he gives us sonship and citizenship. When he admits us into his family, he chooses to renovate our heart and rebuild his image in us. But the prime focus is not our attitudes and behavior. It is our hearts.