"Yeah." Hal nodded, kicked back another sip before he continued. "If Kilowog taught me to ringsling, Sinestro was the one who taught me how to be a Green Lantern, and not just some dumbass kid with a power ring and a huge chip on his shoulder. I got my life back on track because he would only accept me at my best."

You know, before he then derailed Hal's life completely by siccing Parallax on him. Details.