The size of your success is determined by the size of your thinking — and thinking bigger is a learnable skill.

The short version: a quick read to help you decide. Not a replacement for the book.
Schwartz is relentlessly concrete — every principle comes with specific, testable techniques.
People who achieve large things think at a larger scale, which produces larger actions and results. Belief in success is the indispensable ingredient.
1. Believe you can succeed — and you will.
Belief drives behaviour, behaviour drives results, results reinforce belief.
2. Cure yourself of excusitis — the most common disease of failure.
The excuse is rarely the real barrier.
3. Build confidence by doing — not by waiting to feel confident.
Confidence is built through action, not before it.
4. Think and dream creatively — ask "how can I do better?" constantly.
These questions keep the mind oriented toward growth.
5. You are what you think you are — manage your environment accordingly.
Curate the people, conversations, and inputs that shape your thinking.
Anyone who suspects they are playing smaller than their actual potential.
Principle: Excusitis is the most common barrier to bigger thinking.
The action: Assess whether you use health, intelligence, age, or luck as excuses.
Principle: The size of your thinking determines the size of your results.
The action: Write your goal, then a 10x version, and examine the gap.
Principle: Confidence is built through action.
The action: Take the smallest version of an avoided action this week.
Principle: You are what you think you are.
The action: Assess your people, conversations, and inputs and identify one upgrade each.