I think that what makes someone what they are, in other words, what gives them their identity, is their mind. What (and if!)someone thinks is the most important part of that person. Actions just show what someone is thinking.
I would say actions thoughts both play strong roles though really you could probably simplify this to just thoughts considering that almost all actions originate in thought. One way or another intentions are incredibly important to actions and you lose them if you only regard the actions and not their origins.
I hope not. "The road to hell is paved with good intentions"... i hate that quote... cause basically its saying that no matter how you felt or wanted or though, you do something wicked and go to hell, no matter if your thoughts were well intended and pure...
i think people are "defined" already, and our actions are just the reflection of our inner workings interacting with the world around us.
I think a person becomes a whole from a couple of things. Each persons DNA has some very strict programming. It does not entirely define a person, but it is kind of like the framework for a building. Once the person is exposed to an environment they begin to learn the environments values.
There is a lot of controversy regarding how much impact an environment has on a person. Some people seem to think everything about a person derives from an environment. I find this hard to believe due to the fact that different people under the same circumstances make different decisions. However I could be wrong. People make decisions based on past experiences. If there is not past experience to relate to, all the person can do is guess. Different thought processes will occur between different people because each person has a unique perspective on the environment. They might all see the same objects, but each person will have thier own feelings and ideas about the environment.
I would say environmental programming defines a person more than DNA. DNA however holds pieces to the big puzzle. It defines who has the most potential to become an alcoholic for instance. Despite the fact that DNA might indicate this, it does not guarantee a persons character will not overcome this.
What truly defines a person is their ability to show strength beyond what has been forced upon them.