WHEN HE was made Cabinet Secretary, Lord (Gus) O’Donnell placed in his office a motivational slogan: “only the first step is ­difficult”. This came from a chronicler’s account of the martyrdom of St Denis, the third-century Bishop of Paris, who, after being beheaded, carried his head for six miles and preached a sermon.Last week, the former head of the Civil Service gave his erstwhile colleagues another piece of Christian advice: “turn the other cheek”. Delivering the Sir Michael Quinlan Memorial Lecture on ethics and the civil service at the Treasury, where he was once permanent secretary, Lord O’Donnell – nicknamed “God” on account of his initials – said the words of Our Lord were necessary given the “many times