After stressing over a query letter for hours last night to the point I couldn't sleep, couldn't write, couldn't eat (and I promise, that's extremely unusual), I took a walk. Walking's good for stress, and once in a while, some nugget of truth or enlightenment descends.
Now, this isn't new or genius, but neither is a deep breath of warm, evening Tucson air--down, down into starved lungs.
What I learned? In my query letter... just be myself. Yes, be professional and witty and beautiful--if I can--but at bottom, my book came from inside me and so should my query. What a freeing realization! Yay for walking (and being able to eat).