You must have complete determination. The worst opponent you can come across is one whose aim has become an obsession.
Bruce LeeThe ideal is unnatural naturalness, or natural unnaturalness. I mean it is a combination of both. I mean here is natural instinct and here is control. You are to combine the two in harmony. Not if you have one to the extreme, you'll be very unscientific. If you have another to the extreme, you become, all of a sudden, a mechanical man No longer a human being. It is a successful combination of both. That way it is a process of continuing growth.
Bruce Lee