Today's second reading (which was accidentally read first) warns of people who claim to be Christians, but don't follow the Commandments. Two thousand years ago they were having the same problem as now: people who use Jesus for their own ends but who don't do what He asks. I'm not one to point fingers in this regard. There are a number of areas in my life where I could do better, but I take the easy way instead.
The Gospel has Jesus appearing to His disciples while they are hiding. To prove that He is not a ghost, He asks them for something to eat (all they have are a couple pieces of baked fish) and then eats it in front of them. Even today, people are constantly putting Jesus to the test. Even when He "passes" the test, they are still too willing to dismiss what they have seen. Jesus puts up with these demands with patience. He knows that what He offers is not easy to believe. Even His own disciples struggled, He cannot expect us not to.
Meanwhile, Jesus patiently loves us.