In episode 6 of season 1 of House of Cards. Frank is caught in the teacher's strike crisis. And that night he stays awake in office with Doug Stamper. He appears tired. When Doug says "You should go home, I can take it from here'
"Vigilance, it's good for the soul."
Why does he say so ? What does this mean in this context ?
I searched google and could not find any explanation on this. Could you please help ?