The church in Philadelphia had an opportunity to share the good news with others. This is what Jesus meant about the door he had opened for them.
In 1 Corinthians 16:9 and 2 Corinthians 2:12, Paul had also written about doors like that being opened. The believers in Philadelphia didn’t have enough strength on their own. Jesus would give them the strength to do what he wanted them to do. He would make them as strong as pillars in God’s temple.
Jews who didn’t follow Jesus opposed them. Jesus promised that even those Jews would one day recognise that Jesus loves his followers.
The believers in Laodicea had become proud. They no longer recognised how much they needed Jesus. Jesus corrected them because he loved them. He was like the master returning home in the story he told in Luke 12:35–38. He wanted the believers in Laodicea to be ready to receive him when he returned. He promised to share a meal with those who received him. This showed how deeply Jesus loved them and wanted them to be joined to him.