Collins used the line to open Good to Great and to set its thesis: organizations and people stay merely good because good is comfortable enough to remove the pressure to change. In the sentences right after it, he applies the idea to schools, government and individual lives, not only to companies.
The line became the book’s shorthand. A 2001 review in The Nation ↗ summarized his argument with it. Collins returned to it in his 2005 monograph Good to Great and the Social Sectors, as Wikiquote records ↗, where he called it “not just a business problem” but “a human problem.”
Few people attain great lives, in large part because it is just so easy to settle for a good life.