Why is it that holiness has become an unpopular word among Christians? Is it because holiness has become associated with being 'so heavenly minded that we are no earthly good'?
The Holy Spirit
In verse 25, chapter 13 of John's Gospel, the Spirit of Truth is called the Holy Spirit. In other words he is concerned about holiness. It is certainly true of much modern Christianity that there is not the same concern for holiness as there was.
Some imagine holiness as being similar to a stained glass window where the saint hovers a few feet above the ground and looks beautiful and saintly but does not have any contact with reality! Could it be that holiness is associated, even subconsciously, in some evangelical minds who think they have long since abandoned that type of thinking, with that kind of removal from the world? But the requirement of the Lord for his people to be holy as he is holy has not changed. This major concern of the Lord for his people ought to be our concern.