PITTSBURGH  Steelers safety Troy Polamalu opened his red leather-bound playbook to a dog-eared page. “The life of a man hangs by a hair,” he began reading in a voice as soft as falling snow. “At every step our life hangs in the balance.”

It was three days before the Steelers’ A.F.C. divisional playoff game against the Baltimore Ravens, a matchup in which the Super Bowl aspirations of two worthy contenders hang in the balance, and Polamalu was getting himself centered.

“How many millions of people woke up in the morning, never to see the evening?” Polamalu read. And then: “The life of a man is a dream. In a dream, one sees things that do not exist; he might see that he is crowned a king, but when he wakes up, he sees that in reality he is just a pauper.”

The book in Polamalu’s hands, “Counsels From the Holy Mountain,” guides him in football and in life. It contains the letters and homilies of a Greek Orthodox monk, Elder Ephraim, whom Polamalu described as his spiritual doctor.