The day you stop learning is the day that you die. I'm in an industry whereby continuous learning and training is the order of the day. You can never be complacent and say you've arrived. This is particularly true in the world of today where technology is moving at a break neck pace. For instance 2 years ago nobody knew what an ipad is but it is now ubiquitous. So it is in life you've got to keep on improving, keep learning new ways, new tricks and techniques to survive.
If we continue leaning on what we've learnt before we could render ourselves obsolete. If you look at the business world there are countless companies that fell by the wayside due to their reluctance to adapt e.g the once mighty Kodak is teetering on the brink of collapse. The ones who survive are the ones who are able to read trends and react to them constantly on the look out and constantly improving. There's something I was taught in a talk given by Titus Naikuni when I was still in uni- expect 3 things change, complexity and competition.
So don't get complacent keep learning and not just academically but from the world at large. That way you'll keep yourself relevant.