"Remember to always be yourself ... unless you suck." (I'm getting that one printed on a t-shirt)
"The two things that matter the most to me: emotional resonance and rocket launchers. Party of Five, a brilliant show and often made me cry uncontrollably, suffered ultimately from a lack of rocket launchers." (Looking back, rocket launchers on Buffy, Angel, Serenity and I think there was one in Dollhouse, too. Joss might be on to something here.)
"No matter how far you've sunk ... there's always more down."