Motivation
responsibility
The root of all the motivation or inspiration you have ever felt in your entire life are goals. Goal setting provides you the foundation for your drive. By making a goal you give yourself a concrete endpoint to aim for and get excited about. It gives you something to focus on and put 100% of your effort into and this focus is what develops motivation.
Goals are simply tools to focus your energy in positive directions, these can be changed as your priorities change, new ones added, and others dropped.