]ob 32:8 But there is a spirit in man: and the inspiration of the Almighty giveth them understanding.
Our understanding of the things of God comes from The Holy Spirit in you if you are willing to listen to His teaching.
When The Holy Spirit was on people they were empowered to do things for God. This is the same as The Baptism of The Holy Spirit in the New Testament where the effects of the Baptism are permanent while in The Old Testament the anointing may have only been for a period. Anointings in The New Testament are cumulative (the build on the previous gifting and anointing) where in the Old Testament they were not.
(lSa l0:6) And the Spirit of the LORD will come upon thee, and thou shalt prophesy with them, and shalt be turned into another man.
(1Sa 16:13) Anointing for service to God
(1Sa 16:14) They could lose the anointing of The Spirit through Sin
(2Sa 23:2) The Holy Spirit told people what to say
(1Ki 18:12) He directed people where to go
(Isa 40:7) The Spirit carries out judgment
(Isa 40:13) No one can guide or teach The Spirit ( as He is God)
(Isa 59:19) He is with you in battle against the enemy (Satan)
(Isa 61:1) The Spirit of the Lord GOD is upon me; because the LORD hath anointed me to preach good tidings unto the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound;
(Isa 63:14) He leads the people of God in a way that will bring God Glory.
(Eze 37:1) Gives prophetic visions
(Mic 3:8) Empowers His prophets to call His people to repentance
(Gen 1:2) He was there when the earth was created and took part in it
(Gen 41:38) Spirit led people will stand out from the crowd
(Exo 31:3) He fills us with wisdom, understanding, knowledge, and in all manner of workmanship, to do the work of Jesus
(1Sa 10:10) Guides people to prophesy for Him
(1Sa 11:6) Convicts people of their sin
He makes us and keeps us alive:
(Job 27:3) All the while my breath is in me, and the spirit of God is in my nostrils;
(Job 33:4) The Spirit of God hath made me, and the breath of the Almighty hath given me life.
God Creates (Gen 1:1) and man can only build on what He has created. God gives life to His creation (Gen 2:7) which is why the spirit/soul and the fleshly body can be treated separately by God so He can restore the spirit while it inhabits this corrupted body of flesh and later in heaven give you a pure (resurrection) body to replace this corrupted body of flesh.
It can be seen that the work of The Holy Spirit in The New Testament is a carrying on of His work in The Old Testament with one difference. His presence is now permanently in the people of God so there is no diminishing or reduction in His work as it is permanent, building on the past life of the person unlike the Old Testament where He may only have resided on a person for a period then left.