His Purpose

Romans 8:28-30 ESV 

28 And we know that for those who love God all things work together for good, for those who are called according to his purpose. 29 For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. 30 And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.

The purpose of God for mankind is to be conformed to the image of His Son. He predestined the way for this to take place. That way is His Son. Jesus calls all to come. Those who do are justified, then glorified to become among the many brothers of Christ.