Friends have all things in common.
You can't manage what you don't measure, and you can't improve what you don't manage.
Understanding the fundamental limits of quantum computation is crucial for its future development.
If you ask me what I came into this life to do, I will tell you: I came to live out loud. 
Life is like a journey, don't worry about the destination, but enjoy the scenery along the way and the mood of seeing it.