The only direction to grow is outwardly. And that which does not grow, will surely die. Compare for example a rock and a piece of coral, seemingly two very similar hard objects. But the only future for a rock is erosion, whereas a piece of coral can grow into an entire barrier reef. Growth is vital to life. Indeed some would say it is the very thing that distinguishes a living object from a dead one.
Anonymous artist quote from CMCentral.com