In Steve's article he mentions that his book is based on 7 core principles that are at the core of all personal development related... err... "stuff".
However, on his
keynote speaker page, Steve mentions that one of his keynote speeches is about the 3 "fundamental" principles of personal growth.
I'd surmise that the 3 "fundamental" principles are the essential patterns found within the 7 core principles Steve is covering in his book.
Either way, there's lots of interesting (and useful) info you can draw from this, assuming my theory is accurate. It almost makes me want to avoid reading Steve's book so I can see if I can discover these concepts for myself (since that type of work is my forte).