A Form of Godliness that Denies Scripture

John MacArthur, writing in his 2 Timothy New Testament Commentary:

"It is tragic and puzzling that so many preachers who recognize Scripture to be God's own Word spend more time investigating and interacting with the limited and imperfect minds of other men than delving into the infinite and holy mind of God. Part of the reason, of course, is that many hearers do not really want to delve into the depths of God's righteousness and truth, because it exposes their own shallowness and sin. Paul already has warned Timothy about the danger of those who hold 'to a form of godliness, although they have denied its power' (2 Tim. 3:5). Later in the present passage he will warn again that 'the time will come when they will not endure sound doctrine;...and will turn away their ears from the truth, and will turn aside to myths' (2 Tim. 4:3-4; cf. Acts 20:29-30). 
by John MacArthur, The MacArthur New Testament Commentary: 2 Timothy