What motivates people to change is a relentless and innate d

What motivates people to change is a relentless and innate desire for self-improvement.Rarely ever has history seen a man or society kick back,relax,and say “Well that about does it.Not much else to do here!” Within every person is the potential to achieve greatness in some form; be it athletically,mentally,spiritually.This inherent potential demands that people continue to explore and change both their environments and themselves throughout their life’s course.
这里的within every person is the potential to achieve greatness in some within是什么用法,意思?翻译一下这个句子.