Impetus

What is your impetus? Can you identify why you must move forward and dare to reach outside of your arm’s length? Is it a creative force that won’t let you rest? Is it the need to analyze and organize? Are you compelled to make the life of children better, or those of a certain social class, age, or ethnic group? Is it a need for “success?” Do you need to construct syntax or something withers within? Has God placed in you or upon you a desire to do something great? There are myriads of reasons and you have your own unique set. How about keeping the question hanging overhead for a day: what drives me? Or as the actor says: “What is my motivation?” Identify your impetus and let it be the force that propels you forward.

http://www.merriam-webster.com/dictionary/impetus