Because I will embrace any challenges that come my way. I have what many others don't: A passion for excellence. I am highly qualified to perform this job to the best of my ability, and that is what I will bring to it every day...my best.
You can say simply that you will achieve all your targets set by the company by working with honesty and devotion. You can say that you will utilize all your education and experience to complete all the assigned tasks well in time.