Now I find what I assume is the original source of the quote from HBS professor Howard Stevenson:
Entrepreneurship is the pursuit of opportunity without regard to resources currently controlled.
This is a slightly purer form of the concept … not optimizing, but pursuing opportunity. I like it. Gompers’ juxtaposition of management and entrepreneurship is itself elegant and powerful, but more as a comparison than the Stevenson wording where entrepreneurship stands alone.