Look to the creed.
***I believe in the Holy Spirit, the Lord, the giver of life,
who proceeds from the Father and the Son, ***
The word*** spirit ***comes from the Latin word spiritus which means breath. The Holy Spirit is the breath of God. It is what gives us life.
It is the spirit that gives life, the flesh is of no avail; the words that I have spoken to you are spirit and life. (John 6:63)
The Holy Spirit proceeds from the Father and the Son - the Paraclete, the Helper, the Counselor, the Advocate.
"If you love me, you will keep my commandments. And I will pray the Father, and he will give you another Counselor, to be with you for ever, even the Spirit of truth, whom the world cannot receive, because it neither sees him nor knows him; you know him, for he dwells with you, and will be in you. (John 14:15-17)
Jesus says that if we love him and obey his commandments then He and the Father will come to us and make their abode in us.
Jesus answered him, "If a man loves me, he will keep my word, and my Father will love him, and we will come to him and make our home with him." (John 14:23)
By we is meant the Holy Spirit - God, the Third Person of the Trinity, dwelling inside of us to help us grow in holiness.
I recommend slowly reading and meditating on John 14 through 17.
-Tim-