I loved the first 2 parts and found the third part, just ok. The book is broken down into 3 parts...the Power to SEE, FEEL and DO what you believe.
In the first part, the Power to See, one line stood out, "Our beliefs shape what we see, which influences how we act, and this in turn affects how others respond, ultimately confirming our initial belief." The way we perceive things influence what we believe, and as the author says, "That's were belief lives: nestled between fact and faith."
The second part, The Power to FEEL, he highlights that what we believe about things shape how we feel, which then confirms those feelings and the cycle continues. He talks a lot about the idea of pain and discomfort and how those feelings affect what we believe about certain things. The most thought provoking idea in this section is "Sometimes our preconceptions cheat us out of fresh experiences. If you assume a meeting will be useless, you might mentally check out and indeed get nothing from it. The anticipation of uselessness becomes self-fulfilling." That is so true and has challenged me to think and approach things differently.
Finally in the last section, The Power to DO, I just breezed through it. It was more of the same for me, nothing really groundbreaking. Good reminders on other prevalent thoughts, but not many new ideas that caught my attention.
Summed up: "The Three Powers of Belief operate in a continuous loop: What you believe directs your focus (attention), which shapes your expectations (anticipation), which fuels your actions (agency)."