As a mentor, I spend a lot of time calming people down. This is I suppose my mother hen approach to mentorship, but it seems to work for the subset of people who I take on. I wrote a letter to someone who feels recently like she's failed because she doesn't have a firm grounding on the basics of what she's trying to learn. She doesn't see the progress she's made, or the ground she's gained- she only sees what she doesn't yet understand. I've written this letter to many people in the past, and I suspect I'll write it many times in the future. Here is what I usually say, more or less, with the identifying bits left out.