God created Man to be in eternal communion with Him.
God totally foreknew all who would have the potential to recognise Him as Sovereign.
He gave Man Free Will to freely and willfully recognise His Sovereignty with the full knowledge that Free WIll Man would rebel.
When they did rebel, Free WIll ceased to temporally exist.
Recognising His Sovereignty necessarily requires that equality with Him is not something to be grasped or considered. This is original sin and is common to all Man.
God chose to redeem the persons with the potential to accept His Lordship from the slavery to Sin placed on all Mankind by Free Will Man.
These elect God predestined to adoption into Eternal Communion with Him by preparing a method by which sinners could escape His Judgement of Man.
Jesus Christ is God and came into Creation as Free Will Man, "through" Man, but not "of" Man in order to become an atemporal infinite sacrifice for all those whom God foreknew.
God sent the Holy Spirit as a gift to comfort, counsel and provide internal confidence to the Elect, post-Christ.
For those God has chosen, elect and adopted, He enables to escape their spiritual blindness caused by the slavery to sin.