I really like this:
If you have any sort of problem in your life, if you are injured, sick or in pain, you can rely on your will alone to cope with it. If you want it strongly enough you will manage to jump farther or higher, run faster, hold your breath longer, stay awake longer, keep fighting, and so forth. Your willpower is the most powerful tool you have; without it you are nothing – and those with a strong will are the masters of this world. Willpower is more important than skill, physical strength, wisdom and even good health!
Read more here.
No more excuses. We can and WILL overcome our problems.