The Bible attaches far more importance to unity than the church has often acknowledged. Paul uses the strongest language when he says to a divided church in Ephesus 'spare no effort to preserve the unity of the Spirit in the bond of peace.' (Ephesians 4:3 - the author's translation.
If the truth be told Christians have spared themselves a great deal of effort in their area of their faith and often have just ignored the problem in the hope it would go away!
Mark Johnston steers a Biblical way through the principles of achieving the desire of Jesus that His people would be one.
As John Benton said about the book "... this should prove a rebuke to the hard-hearted and a corrective to the soft-headed, and a stimulus to all evangelicals of good will towards God-honouring unity."