That's the title of my new book on realization your potential in life. There is no tomorrow. All we have is now. There is no tomorrow, the future is a little more than an illusion.
If your not moving towards achieving your personal goals, start now. If your not advancing in your career, start now. Don't wait. Do what it takes to make your life what you want it to be.
Also, Happy (late) Winter Solstice, may you find strength and renewal in the power of a new year and die to yourself in some areas, so that you may live.