If you get stuck, you tell yourself in whatever way you want, and honestly, some version of the following: "I don't understand this thing that is happening, but I know there is a cause. It does not happen without cause."
Honestly, it's a bit odd, and I don't know if that's the best way to express it in English. Nevertheless, several people have some back to me and told me that it has helped them.
My initial inspiration, and hypothesis is that the simple acknowledgement that I don't understand the problem, and that the problem still - despite my lack of understanding - still follow the laws of cause and effect, somehow temporarily halts our brains tendency to protect our ego at almost any cost, logic be damned.
I started trying this out after puzzling about why it's unreasonably common to figure out the answer to something only moments after you get up from your desk to go ask someone else for help, even when you might have worked with it for hours. It had to have a reason, although I don't know exactly what it is!