Why is the concept of being gathered by God important?

In Isaiah 56:8, God says, 'The Lord God which gathereth the outcasts of Israel says, yet I will gather others to him besides those that are gathered.' This illustrates that God's initiative in salvation is based on His grace, as He gathers those who are estranged, whether they be Jews or Gentiles, into one family. The promise of gathering signifies that we are not left to our own devices; rather, God actively unites His people, assuring us that our spiritual state does not disqualify us from His promises. This gathered body includes everyone who comes to Him in faith, authenticated by Christ's work.