Irenaeus of Lyon
The way of those who belong to the Church extends throughout the whole world, because it possesses the firm tradition from the Apostles. It lets us see that all have one and the same faith.
For all receive one and the same God the Father. They believe in the same divine economy of the Incarnation of the Son of God, and know the same gift of the Spirit.
They keep the same commandments, maintain the same form and order of the Church, await the same coming of the Lord, and admit the same salvation of the whole man, that is, of soul and body.
The preaching of the Church is true and firm, since in her the one and same way of salvation is shown throughout the whole world.
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The light of God has been entrusted to her. Therefore the Wisdom of God, through which she saves all men, is sung at the gates, utters her voice openly in the streets, is proclaimed on the high walls, and speaks continually at the city gates (Prov 1:20-21).
For the Church preaches the truth everywhere, and she is the seven-branched lampstand bearing the light of Christ.