After reading chapters 9&10, a big phrase that stood out to me was Achieved identity. This is something that most, if not all, adolescents go through in middle adulthood. They're all trying to figure out themselves after puberty, continue on the road to self awareness and in doing this, shape their futures by their decisions.
My daughter's current favorite movie; King fu panda, has a quote in which Master Oogway tells Master Shi Fu that " My friend, the panda will never fulfill his destiny, nor you yours, until you let go of the illusion of control." I feel this is relevant because a lot of us, myself included, who are currently in middle adulthood feel that they are responsible for their future but in reality only God has a plan and knows the full extent of the outcome of your decisions.
As you go through life, your decisions will affect you in both the mental and physical way though such as poor diet or a reliance on substances, which may be an example of negative decisions, that may lead you to change your habits and alter your identity. Also mentally you are continuing to rely on outcomes of previous life stage decisions to help you attain and continuously evolve your identity.