From Robert Caro:
Finally, he raised his head. “I didn’t know someone from Princeton could do digging like this,” he said. “From now on, you do investigative work.”
I responded with my usual savoir faire: “But I don’t know anything about investigative reporting.”
Alan looked at me for what I remember as a very long time. “Just remember,” he said. “Turn every page. Never assume anything. Turn every goddam page.” He turned to some other papers on his desk, and after a while I got up and left.