Custom was to give the best wine at the beginning of a celebration. As the party went on the quality of wine would diminish. 

So when the ruler of the feast tasted the wine that came towards the end of the celebration he was shocked by the taste-it was better than the first round. 

The ruler of the feast was oblivious as to why the wine tastes so good; Jesus had just performed his first miracle in making it. 

In that first miracle Christ shows us that he doesn’t adhere to the standards or customs of man but that when he blesses he always gives what is best. 

Isn’t it good that you serve a Savior that throws protocol out the window when it comes to blessing you?