This catholicity of the church, as the Scriptures portray it for us and the early churches exemplify it for us is breath-taking in its beauty. Whoever becomes enclosed in the narrow circle of a small church (kerkje) or conventicle, does not know it and has never experienced its power and comfort. Such a person short-changes the love of the Father, the grace of the Son, and the fellowship of the Spirit and incurs a loss of spiritual treasures that cannot be made good by meditation and devotion. Such a person will have an impoverished soul.
By contrast, whoever is able to see beyond this to the countless multitudes who have been purchased by the blood of Christ from every nation and people and age, whoever experiences the powerful strengthening of faith, the wondrous comfort in times of suffering to know that unity with the whole church militant that has been gathered out of the whole human race from the beginning to the end of the world, such a person can never be narrow-minded and narrow-hearted.
Herman Bavinck The Catholicity of Christianity and the Church