Paul has to leave the new church quickly and has concerns about tough things he had said to them. Did they accept them? Reject? Were they mad at him? He sends Timothy and gets a refreshing answer to his relational doubt.
Biblical Grit, which is defined in scripture as Christian steadfastness and endurance. This type of Christian grit is full of hope because it has at its core a faith that rests in God's promises, and is empowered by grace.
