A constant thirst and quest to be better and to push the envelope.

‘‘It’s something that’s inbred in Theo,’’ McLeod said about Theo Epstein. ‘‘I don’t think he knows what the word ‘stagnant’ means. As soon as you start feeling comfortable with how things are running, he’s asking you why we aren’t trying other things. .  .  . It’s just a constant thirst and quest to be better and to push the envelope. It’s in his DNA, and it filters down to all of us.’’