When something becomes commonplace, it can lose its impact.  Similar to living your entire life next to train tracks the noise of the train can (over time) become obsolete.  One of the greatest dangers in the Christian life is when the cross becomes commonplace.  If you've been a Christian for any amount of time you know that this is a real struggle.  Mark 14 reminds us of the fact that the cross is the single most transformative event in the history of humanity.