Walon's speech to the addicts at Narcotics Anonymous in Season 1. He's a world-weary addict who's been through hell and back, and he refuses to sugarcoat the truth of how badly addiction can screw up one's life. But in spite of it all, he makes it clear that he's there to remind every fellow addict in Baltimore that they're not alone.
Walon: When I was out on them corners, not a pot to piss in, with everybody who ever knew me or loved me cussing my name, you know what I told myself? I said, "Walon, you're doing good." I surely did. I thought I was God's own drug addict. I figured that if God hadn't meant for me to get high, he wouldn't have made being high so much like perfect. Now I know I've got one more high left in me, but I doubt very seriously that I have one more recovery. So if there's anybody out there that sees that bottom coming up at them, I'm here to talk sense. I don't care who you are, what you done, or who you done it to. If you're here...so am I.