Before the widespread accessibility of the internet, most theological debate moved at the speed of journal publishing, which is to say, slowly. There was a time when perhaps two years would pass before an author would see critical reviews of his or her work. Today, controversial books will be dissected by bloggers and Amazon reviewers before most readers even know the book has been released.
This is just one way the terms of theological debate have changed, according to Michael Horton, who talks in this video with Tim Keller and Matt Chandler about how Christians ought to disagree among ourselves and with other theological opponents. You'll hear them offer several nuggets of wisdom that all Christians would be wise to follow as they call on us to criticize when possible in the context of relationship and state our opponents' arguments in a way they would recognize and own.