With the definite article prefixed, this word always refers to the Holy Ghost, the third person of the Trinity. He is God (Acts 5:3, 4), is eternal (Heb. 9:14), omnipresent (Ps. 139:7-13), omniscient (1 Cor. 2:10), omnipotent (Luke 1:35), is equal to, and one with the Father (Matt. 28:19; 2 Cor. 13:14), He quickens sinners so that they are born. again (John 3:5, 6; 5:21; 6:63), He seals believers (Eph. 1:13), He is the comforter (John 14:16), and abides with the saints on earth forever (John 14:16), since He descended at Pentecost (Acts 2. and John 8:39), to teach them (John 14:26), to comfort them (Acts 9:31), also to reprove the world (John 16), He appoints and sends ministers (Acts 13:2, 4), directs in preaching (Acts 16:6, 7, 10), is the source of wisdom (John 16:13; 1 Cor. 12:8). He is a person, not an influence, for He can be grieved (Eph. 4:3), vexed (Isa. 63:10), resisted (Acts 7:31), tempted (Acts 5:9), He searches all things (1 Cor. 2:10).
He is now on earth, in each individual saint, and with gathered saints, leading, directing, instructing. We cannot pray to Him as if He were in heaven, and ask for Him to be sent down. He is here, and what we have to do is not to grieve, tempt, resist, or quench Him in His actions and ministry of Christ to our souls.