If you always put limit on everything you do, physical or anything else. It will spread into your work and into your life. There are no limits. There are only plateaus, and you must not stay there, you must go beyond them.
The martial arts are ultimately self-knowledge. A punch or a kick is not to knock the hell out of the guy in front, but to knock the hell out of your ego.
Your experience and your feelings about a thing represent what you factually and intuitively know about that thing. Words can only seek to symbolize what you know, and can often confuse what you know.