What does it mean to be a disciple?

The picture above is a scene that was described to me when I fist attended Sunday School in a little Methodist Church in Nar Nar Goon many years ago. It's a wonderful story. In just two verses we learn so many things about being a disciple of Jesus. Imagine that these two verses were the only information we had available to us describing what a disciple was. How many points could you list from these two verses alone? I had a go at coming up with my own list:

Jesus is actively seeking people to follow Him.
Jesus takes the initiative, he doesn't wait for volunteers
Jesus calls very ordinary everyday people.
His call was an act of grace - The people he called were not doing anything spiritual. They were fishing!
His call was invitation to join in with the mission of Jesus.
His call required an immediate and radical response? It was a yes or no option.
There was no middle ground. You either left everything and followed Him or you said no.
A disciple is someone who follows Jesus.
Jesus chooses the direction, the place and the time. Our part is to follow Him

Well that's my list? Can you come up with some more?