“Woe” is a “strong” word. Those upon whom God pronounces it are in for big trouble – and this is because of their rebellion against Him.
In this passage Jesus continues to show His concern for “these little ones.”
The 99 “saved” do not need to take up the Shepherd’s time. It is the “unsaved,” the lost, who need His time.
Verses 15-17 give us the biblical rule for resolving disputes between Christians. If one refuses this, that one is to be treated as unsaved and efforts made to win that one to Christ.
How about that promise of gathering and agreeing? Not only is He “with us” in a special way, but He will also grant our requests!