" Broadly, those who get the most out of life try to figure out and focus on their core competencies. They know that at least one key difference between happy, successful people, and those just muddling along is that the happy ones spend as many of their 168 hours as possible on their core competencies—honing their focus to get somewhere—and, like modern corporations, chucking everything else. "

― Laura Vanderkam , 168 Hours: You Have More Time Than You Think