4 Bible Verses about Inward Fire

Wherefore, I thought from henceforth not to speak of him, nor to preach anymore in his name. But the word of the LORD was a very burning fire in my heart and in my bones, which when I would have stopped, I might not.

and they said between themselves, "Did not our hearts burn within us, while he talked with us by the way, as he opened to us the scriptures?"

I am come to send fire on earth: and what is my desire but that it were already kindled?

My heart was hot within me, and while I was thus musing, the fire kindled, and at the last I spoke with my tongue,