Difference between Spirit of Prophecy and Prophet

There is a different between having the spirit of prophesy and being a prophet. In the Old Testament, only specially chosen people are filled with the Holy Spirit in special occasions. The prophets are deliberately anointed to speak the heart of God. In the New Testament, the office of prophets continues to exist but by the blood of Jesus every genuine believer has the Holy Spirit dwelling within. The Lord also promised to pour the spirit of prophecy upon all of His sons and daughters. We are all called minister prophetically but not all of us are called to be prophets