In his sermon @ 27:30 min: 2014-09-07 - The Great Question (1 of 3) - Are You the One (Matthew 11.1-6), Timothy Keller said:
"You have not come to grips with Jesus Christ unless you have wrestled with His offensiveness. If He is not offensive to you, you've never felt that, if it's never been a struggle for you, then you don't know who He is!"
This is one of the reasons I don't mind when people call Tim Keller or Redeemer NOT reformed. Because that line alone separates fake reformers (those who have lots of reformed knowledge but have no fruit) from those who practices reformed theology (There is no need to keep shouting "we are reformed, reformed, we sponsor reformed preachers, we buy lots of reformed books").
This is the kind of sermon, in spite of fake reformers' approval or disapproval, I would simply conclude: Those who have ears, let them hear.