What's perhaps scarier is that I was able to find each within a couple minutes of searching. The first is from Fear and Trembling, about two-thirds of the way through the Preliminary Expectoration; the second is from Repetition, near to the end. It wasn't a rational process of working out how their ideas fit into the overall plan of the work. It was an intuitive sense of how far along in the book I was when I first came across them and they lodged themselves in my brain.