I really resonated with the idea of knowing who your opponent is. There are often times where things get tough and I essentially become my own opponent; this can be detrimental to the success of the project, goal, or general happiness. Therefore, bringing this idea to light made me understand how important it is to know who--or what for that matter--you are competing with. Instead of beating myself up about something, it would be better to take this frustration and use it as fuel to achieve my goal. So, I could make it a point that when times get tough and I'm a bit overwhelmed, I need to be sure to revisit the thought: "Know who your opponent is."
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The idea of knowing your opponent is something I find very useful in undergoing projects. I take things that I need to work such as studying for a test that is really important in determining my grade and make them sort of my "opponent" which helps me put my energy into accomplishing that work which I view as "beating my opponent". I think this team analogy helps me a lot in terms of motivation.