simmer.

"I often study some important topic of Scripture using what I call the "Crock Pot" or slow cooker method.  That is, I let it "cook" slowly over the back burner of my mind for months, even years.  That has been true with the subject of God's grace.  It has been on my "back burner" for more than ten years.  I've written three other books during that time, but my mind and heart have kept coming back to God's grace" (Jerry Bridges, Transforming Grace, p. 12)