“For it was fitting for him, for whom and through whom all things exist, in bringing many sons to glory, to make the pioneer of their salvation perfect through sufferings.”
God’s project is to bring many sons to glory. Christ’s followers become God’s children by obedience. Jesus’ death brings them life in God’s family. Glory is the very presence of God.
What is fitting for God? AMP says “an act worthy of His divine nature.” It was by his initiative and mercy.