We cant do everything.  We can only do the things God designed for us to do through the gifts, skills, and intelligence that he has given us!  For example, flowers cant talk or walk, and deer's cant fly.  So in some since our design determines our results and capabilities.  One of the greatest mistakes we can make, is to try and re-design ourselves into to something that God did not intend for us to be.  When we recognize our personal limitations it turns our focus on what we were designed to do!