The best thing any writer can have is a great teacher and mentor. This person could be a more experienced writer, a teacher in a writing program, or an editor—maybe someone who is a combination of all those things. Someone, anyway, who reads your work and does not praise it ceaselessly because you are related by blood or marriage, though there's a place for that in life as well; sometimes we all need an ego boost, however biased it is. But you need someone who will be both encouraging and brutally honest. I have been fortunate to have many such people touch my writing life, but today I remember one startling example in particular: one teacher, one moment. This was in my MFA program, perhaps midway through. I had worked hard all semester, and during a residency in July, there was a student reading. I participated, and I remember that in the audience sat a faculty member I had not worked with directly, but who was a person I respected greatly. After the reading, dinner in the cafete...