The Jews understood that God gave a certain portion of his Spirit to his prophets. When Elijah was about to depart for heaven, his servant Elisha asked for a double portion of the Spirit (2 Kings 2:9). Jesus tells his disciples that they can believe the words he speaks because God the Father has poured his Spirit on him in full measure, without keeping anything back. The function of the Holy Spirit is to reveal Gods truth to us. When we receive the Holy Spirit he enables us to recognize and understand Gods truth. Jesus is the Word of God and he gives us his Holy Spirit so that we can recognize his truth and live according to it. Gods truth has consequences and he gives us the freedom to choose how we will respond. The choice he gives us has eternal consequences everlasting life or everlasting death. God challenged his people in the Old Covenant: See I have set before you this day life and good, death and evil. I call heaven and earth to witness against you this day, that I have set before you life and death, blessing and curse; therefore choose life, that you may live, loving the Lord your God, obeying his voice, and cleaving to him (Deuteronomy 30:15-20).
And he issues the same challenge to the people of the New Covenant today. Do you weigh the consequences of your choices? Do they lead you towards life or towards death? If you choose to obey Gods voice and to do his will, then you will know and experience that life which comes from God himself. If you choose to follow your own way apart from God and his will, then you choose for death a spiritual death which poisons and then kills the soul until there is nothing left but an empty person devoid of love, truth, goodness, purity, peace, and joy. Do your choices lead you towards God or away from God?