This is a quote attributed to St. Augustine. It captures well the spirit which Christian bloggers need when dialoguing with one another about issues where they disagree. (See my previous post Civil Discourse among Christian Bloggers or How to have a Godly Christian Bun Fight!)
Acts 15 tells the story of Paul's dispute with those who taught Gentile believers that they must be circumcised to be saved. It was resolved by a council of the apostles in
For it has seemed good to the Holy Spirit and to us to lay upon you no greater burden than these necessary things: that you abstain from what has been sacrificed to idols and from blood and from what is strangled and from unchastity. If you keep yourselves from these, you will do well. Farewell." (Acts 15:28-29)
I gather from the passage that Scripture teaches that there are essentials required for unity among believers and there are non essentials that are not required for unity.
The essentials have to do with the gospel which is about the person and work of Jesus Christ.
Beloved, do not believe every spirit, but test the spirits to see whether they are of God; for many false prophets have gone out into the world. By this you know the Spirit of God: every spirit which confesses that Jesus Christ has come in the flesh is of God, and every spirit which does not confess Jesus is not of God. This is the spirit of antichrist, of which you heard that it was coming, and now it is in the world already. -- 1 John 4:1-3
An example of a non essential is found in Romans 14:5
One man esteems one day as better than another, while another man esteems all days alike. Let every one be fully convinced in his own mind.
So there is freedom in the non essentials but this freedom is circumscribed by love.
If your brother is being injured by what you eat, you are no longer walking in love. Do not let what you eat cause the ruin of one for whom
Thus our freedom to say and to do what we please is limited by our love for the other person who may be stumbled by what we say or do.
In summary, then, there are essentials of the faith that we must all agree on for their to be unity. There are non essentials (like playing bongo drums in worship services) in which there is freedom. In all of this, love governs our response.