I don't know what to read...

The ministry I’m involved in does not reach only children. This ministry encourages teenagers and adults to come to church too. Therefore a bus ministry is offered to the people who can be picked up and take home between the church and their accommodation. Since Boris started to come back to church, he’s been riding my bus.
Jill, one of the staff members on the bus had several good talks with him recently. She realized one day that Boris needed a new Bible as his was really old and torn. So she told Boris that if he would read the whole Gospel of John she would buy him a new Bible. Boris agreed.
Around two weeks later Boris called me. This is how the conversation went :
“Vivi, are you with Jill ?”
“No, but can I help you maybe or take message for her ?” I answered
“I’m done with reading the Gospel of John and I don’t know what to read now !” Boris said with an urgent voice.
“Well, you can read the Gospel of Mark” I answered back.