Predestined for a Purpose

What is the point of predestination regarding our salvation?

Are there more reasons or verses about this?

Why does the Bible say we (the Saved) are Adopted? Aren’t all people Gods children?

Does the Bible say there are other benefits to being Adopted?

What is Gods purpose and will?

Who are the Beloved?

Have you heard of the perseverance of the saints, what does it mean? How does it tie in with predestination?