There is no end to learning
Every second of your life presents you with an opportunity to learn. The day you think you know it all, that's the day you will have invited failure in your life. We learn from everything around us and from everyone we interact with. from some we learn how to do things and from others we learn how not to do things.
It is true that sometimes we do learn from our own mistakes but that's not a license to keep on making mistakes; its only a fool who insists on learning from his own mistakes. But it is also true that fear to make mistakes is the recipe to failure. Success does not come on a silver platter, its a matter of choice and shear determination; you have to purpose that you want to succeed, you must want it so bad that there is no other option but to succeed.