Naturally, I would have to say your intellect, but that doesn't do you enough justice.
I admire your passion for reasoned discourse, the work you do for your community, and your desire to reach out to new members on TFF. You've made me feel welcome for the short time I've been here, and you couldn't have given me a better first impression of the more social aspect of the furry fandom. I'd even go as far as to say you've helped me lighten up a little. The operative phrase being "little", Mr. Bricket.
And it's always nice to know at least one person who also uses big words.