I have recently came across this wonderful post by Karlien on willpower. The post talks about What is willpower, Why we should have willpower, Habits to have more willpower and some beautiful quotes on Willpower.
Have a look on the post at below link.

Defining willpower According to most psychological scientists, willpower can be defined as: The ability to delay gratification, resisting short-term temptations in order to meet long-term goals. The capacity to override an unwanted thought, feeling, or impulse What you need to know about willpower: The psychological science of self-control – American Psychological Association Why should we […]
Your guide to have more willpower — karlien09
I have also written and published a post on willpower have a look at that also, both the post together will give you good guidance on the topic.