Holiness of Heart and Life

The word "holiness" has become somewhat unpopular, as people associate it with a holier-than-thou attitude, a judgmental approach to others, or a legalistic approach to Christian life.

But holiness is a word that is used a great deal in scripture and has a long history in Christian theology. Is it possible to talk about holiness as a positive element in living? Can people be called to be holy and i...