Martial Arts are a way in which we can express ourselves purely and honestly.
The gift that Martial Arts has brought to us all is that they revolve around the person practicing, not uncontrollable factors or fate. For example: the main reason for a person's success when working on the stock market is purely down to share rates taht they can't control, it's just fate.
In Martial Arts you are responsible for your success. The expression starts when you perform your skills. What you put in is what you get out. Just a simple movement can be artistic when mastered.
When a Sifu performs movements they appear far easier and simple than they are in reality. For me in Wing Chun I have spent a year and a half understanding the first form 'Siu Lim Tao' but every time I see my Sifu perform the form I see the amount of training he has undertaken from his higher level of precision and understanding, he hasn't just become a Sifu by training for a while he has trained hard to be able to express himself with Sifu standard (which is what is demanded at FMK I believe). It is very easy for a beginner to learn movements just like a dance routine. Yet one core concepts are understood and lots of training is done, your moves become more skillful and are executed with more precision.
Bruce Lee's idea of the Martial Arts being a way to 'honestly express yourself' is actually very deep. Not just showing you can do a particular move/ train in a certain style but how well you have trained and cared for your development. This is the essence of Martial Arts.
For me I didn't just start Wing Chun because I wanted to get fitter (although this was an important reason for me) I thought if I want to get fit, why not join a health club?
Then I thought for self-defence, however I thought why spend all that time training just in case I get into just 1 or 2 fights in my life (hopefully I never get into any) so this didn't completely sell it for me.
Then I realised the expressive side taught by Bruce Lee. It's not always the quality of the art but instead the quality of the person's mindset and discipline in training that determines their level in the Martial Arts.