Ignatius was Bishop of Antioch from 67 to 107 AD. On his way to martyrdom in Rome he wrote a letter to the church at Ephesus urging them to unity. In practical terms this comes from spending time together with other Christians, a natural consequence of faith seeking love. He writes:
Try to gather together more frequently to give thanks to God and to praise him. For when you come together frequently, Satan’s powers are undermined, and the destruction that he threatens is done away with in the unanimity of your faith. Nothing is better than peace, in which all warfare between heaven and earth is brought to an end.
None of this will escape you if you have perfect faith and love toward Jesus Christ. These are the beginning and the end of life: faith the beginning, love the end. When these two are found together, there is God, and everything else concerning right living follows from them. No one professing faith sins: no one possessing love hates. A tree is known by its fruit. So those who profess to belong to Christ will be known by what they do. For the work we are about is not a matter of words here and now, but depends on the power of faith and on being found faithful to the end.
My spirit is given over to the humble service of the cross which is a stumbling block to unbelievers but to us salvation and eternal life.