Who is the Holy Spirit?

 

After sin creeped in, we forfeited God's position in our hearts, as we use to meet with God in the Garden everyday. Since then when God wants to speak to us, His Spirit will rest over a person then when that person have spoken what God want to speak or do the spirit will leave the person.

We see this in David and Saul, it's written in 

1 samuel 16: 13  
So Samuel took the horn of oil and anointed him in the presence of his brothers, and from that day on the Spirit of the Lord came powerfully upon David.

 and later on we see David  weeping in Psalms asking God not to remove his Holy Spirit from Him.

But in all this God wanted to correct his position in man's world, He was preparing to dwell inside man, because he knew a fallen man isn't capable to do Good on his own, as when you read the bible, Esraelites and their kings all reach a point where they go astray thats why it's written we have all sinned all have turned away..in Romans 3:23.

So God have to pay the penalty of death that He set for us, so that we can walk out as his sons again.

But

He also get to stay inside man's heart and give him necessary strength, wisdom to follow God in accomplishing the plan that God have for Him in this life.

That's why we hear Jesus telling his students that He have to leave so that Holy Spirit can come in and take over.

Now instead of God walking with us during the cool of the day, now God lives inside of us, fellowshipping with us 24/7, to find Him we simply have to hear from with in.

Holy Spirit seals the mark of Trinity by living inside us, as Jesus said when one is ready to receive Him, then All(God The Father, Jesus and Holy Spirit) will come and dwell.

What grieves the Holy Spirit?

Unrepentant heart, grieves the Holy Spirit , as He loves us dearly, when we go aside our good way and hold on to sinful desires and pleasures, He is grieved.

What is the primary work of the Holy Spirit?

To help us transform to become true sons of God ready to receive our inheritance and walk in God's purpose. And also to invoke God's nature in us and make it our primary appeal everyday.

Also we can't wash ourselves off sins or transforms us to become good sons of God, He is the one who cuts down all our weaknesses which made us prone to go back to bad ways.

So once we surrender to Him, we allow Him to instill in us His nature which holds his fruit that helps us to become better.

Galatians 5: 22-23 

 But the fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, 23 gentleness and self-control. Against such things there is no law

What makes The Holy Spirit leave?

Mocking The Holy Spirit is unforgivable sin because aside from everything else and Him being Gentle, Kind you must not forget you are dealing with King of Kings,  LORD of Lords, Alfa and Omega, the beginning and the end, so make sure you know at which audience you are at, before saying anything else.

Moses was told to remove his sandals as he was Near Him and that place was declared Holy, now that God leaves inside of you that's why you also being told to keep away from council of fools.