What makes some people succeed and others fail?

What makes some people follow through and others quit? I thought about this today because I skipped my workout yesterday. I was still a little sore all over and felt I needed a day off. I still ran in the morning so I was getting a workout that way but no weights. I know it is only one day off. The difference between one day off and quitting is "I will".

When I started working out a few years ago I still remember my thought, it was like an on/off switch in my head. I thought "I will" lose this fat and improve the function and appearance of my body by bodybuilding. Sure, I took a lot of steps after that but that first act of setting my mind to it is what made everything else happen. Getting that mind-set came before specific goals. The "I will" comes before the goal setting. The "I will" comes before the first step. The "I will" is what continue me down this path.

Thomas Edison set his mind on developing a practical incandescent, electric light. He actually did not invent the light bulb but improved upon it. In order to improve it he actually had to create seven system elements that were critical to the practical application of electric lights as an alternative to the gas lights that were prevalent in that day.

These were the development of:
1. The parallel circuit,
2. A durable light bulb,
3. An improved dynamo,
4. The underground conductor network,
5. The devices for maintaining constant voltage,
6. Safety fuses and insulating materials, and
7. Light sockets with on-off switches.

Each of these inventions came from the "I will" create a practical incandescent, electric light. Why did he keep going after many failures? There is no quit in "I will". Why will I work out today after a day off yesterday? There is no quit in "I will". If you say "I might" or "I should" or something else like that there is room for "I can't" or "I quit" or "I failed". So fill your life with "I will"s and get to it!