Sisko: He (Eddington) worked under me for a year and a half. I saw him almost every day. Read his reports. Had him to dinner. I even took him to a baseball game in the holosuite once. And I never saw it! It's my job to be a good judge of character, and what did I do? Not only did I not see it, I put him up for a promotion."
Dax: He played his hand well.
Sisko: He played me all right. And what is my excuse? Is he a Changeling? No. Is he a being with seven lifetimes of experience? No. Is he a wormhole alien? No. He's just a man, like me. And he beat me!