My biggest change in thought has developed on the concept of sin. I had always tried to put all actions in two columns, sin and not-sin. Every action fit into those two columns.
I now realize sin is a state, not a series of actions. The world is in a state of sin, I am in a state of sin. Sin is a not an action or a decision, but it is rather a state of absent communion with the Triune God and with my fellow humankind.