To be of one mind biblically doesn’t mean that all have to share the same opinion. It means a warm fellowship based on communion with Christ in the midst of differences. It does not mean abandoning all attempts at refining our knowledge by enforcing an artificial unanimity. True maturity means learning how to disagree in an aggressive fashion, yet still maintaining a peaceful harmony in the church.
Greg Koukl, Tactics: A Game Plan for Discussing Your Christian Convictions, 2009, page 34