Gospel of Thomas Saying 10 Jesus said, "I have cast fire upon the world, and see, I am watching over it until it blazes."
In saying 16 Jesus does not bring peace upon the world but fire war and the sword so in saying 10 Jesus is speaking about the trouble in his day and that of 70 CE and also in our own time
In Saying 82 fire and the kingdom are equivalent terms just as Jesus is equivalent with the Kingdom so here when he throws fire upon the world we should understand that he has come to reveal the knowledge of the Kingdom upon the world.
This is a refiner’s fire, to refine the heart of men for the day of judgement. The knowledge that makes us responsible to the truth comes by faith and faith by hearing and hearing by the word of God. Thus it can make us wise unto salvation by faith in Christ Jesus, for the word of God is beneficial for teaching, for reproving for correction, for disciplining in righteousness. This is the fire of the knowledge of the kingdom of God that saves us 1Cor 3:13-15 for our faith is tried with fire 1pe 1:7vso the forgiveness of sins is to purify the sins of the world with fire.
The fire is also the fire of judgment
Therefore, after we are refined we shall be made like fire just like Jesus is now for Yahweh makes his ministers a flame of fire (God manifestation). (Cp. Saying 82) So by listening to Jesus’ words and abide by them we will overcome our passions. Cp. Saying 7, 8, 9
10)# Jesus said, "I have cast fire upon the world [by showing us the Way, the Truth and the Life which is the fire that sears our individual spirit consciousness (soul) when we are doing anything that we know to be in opposition to the will of the Father - this fire is our inward trial and judgment], and see, I am guarding it until it blazes [for it will either refine (the Elect) or burn up (as chaff) the faithless]."