Dan Millman

There are no ordinary moments.

Source: Way of the Peaceful Warrior: A Book That Changes Lives, Dan Millman, 1980

The signature line of Millman's Way of the Peaceful Warrior, spoken by the Socrates character, and the book's central teaching. It later titled his 1992 follow-up No Ordinary Moments and served as the tagline for the 2006 film adaptation, Peaceful Warrior. Attribution and source work are both solid; I have not verified a page number.

The secret of change is to focus all of your energy not on fighting the old, but on building the new.

Source: "The Way of the Spiritual Warrior"