Integrity as a shelling point.

"Together, they bring together the cluster of characteristics typical of integrity: integratedness; wholeness; consistency in beliefs and between beliefs and actions; steadfastness in appreciation and pursuit of the good; a commitment to virtue that recognizes no countervailing considerations."

"We get a picture here of integrity as perhaps not itself a virtue, because it is the precondition of virtues or the superordinate principle coordinating the virtues."