As our lesson study guide once again misuses the term Spirit of Prophecy I thought I would present the link to my previous article Misuse of the Term Spirit of Prophecy
It is also interesting to note how the lesson arrives at this. The lesson says for January 21:
The closest parallel to the phrase “spirit of prophecy” in the Bible is found in 1 Corinthians 12:8-10. There Paul refers to the Holy Spirit, Who gives the gift of prophecy among other gifts (charismata); and the person who receives this gift is called a prophet.
Now, just as in 1 Corinthians 12:28, those who have the gift of prophecy (verse 10 of the same chapter) are called prophets—in Revelation 22:8, 9, those who have the spirit of prophecy (Rev. 19:10) are also called “prophets.”
“And I fell at his feet to worship him. But he said to me, ‘See that you do not do that! I am your fellow servant, and of your brethren who have the testimony of Jesus. Worship God! For the testimony of Jesus is the spirit of prophecy’” (Rev. 19:10, NKJV).
“I fell down to worship before the feet of the angel who showed me these things. Then he said to me, ‘See that you do not do that. For I am your fellow servant, and of your brethren the prophets, and of those who keep the words of this book. Worship God’ ” (Rev. 22:8, 9, NKJV).
The situation in both passages is the same. John falls at the feet of the angel to worship. The words of the angel’s response are almost identical, yet the difference is significant. In Revelation 19:10, the brethren are identified by the phrase “who hold to [have] the testimony of Jesus” (NIV). In Revelation 22:9, the brethren are called simply “prophets.”
What is interesting is how they say that in Revelation 22 the brethren are simply prophets when the verse is actually far more board because it also includes "those who keep the words of this book". The angel in both cases is instructing that God alone should be worshiped. It is the "testimony of Jesus that defines the Spirit of Prophecy since the term is only used once. It is not a parallel with gift of prophecy. If you recall Caphais had the gift of prophecy even while he was plotting to kill Jesus. Which indicates that even if one had the gift of prophecy it does not make that person a prophet.
(John 11:49 NIV) Then one of them, named Caiaphas, who was high priest that year, spoke up, "You know nothing at all! (John 11:50 NIV) You do not realize that it is better for you that one man die for the people than that the whole nation perish." (John 11:51 NIV) He did not say this on his own, but as high priest that year he prophesied that Jesus would die for the Jewish nation,
For more please read the Misuse of the Term Spirit of Prophecy