Meanwhile the most blessed man, grieved that the devil, who had been driven out of the region beside the ocean, had found for himself a dwelling place in a corner of the island in the hearts of the Picts, girded himself as a strong wrestler to overthrow his kingdom, and put on, moreover, the shield of faith, the helmet of salvation, the breast-plate of charity, and the sword of the Spirit, which is the Word of God. Equipped with such arms and surrounded by a company of his holy brethren, as by a heavenly host, he invaded the empire of the strong man armed, to rescue from his power innumerable vessels of captivity. Wherefore going to the Southern Picts,among whom the error of the Gentiles still prevailed, compelling them to venerate and worship idols deaf and dumb, he preached the truth of the Gospel and the purity of the Christian Faith, the Lord working with him and confirming his word with signs following. The blind receive their sight, the lame walk, the lepers are cleansed, the deaf hear, the dead are raised, the oppressed of the devil are delivered. A door is opened for the Word of God; by the grace of the Holy Spirit faith is received, error abandoned, temples cast down, and churches built. To the font of the saving laver, rich and poor, young men and maidens, old and young, and mothers with their children hasten, and renouncing Satan with all his works and pomps, are joined to the body of the believers by faith, confession, and the sacraments. They give thanks to the most merciful God, that in the isles which are afar off he had revealed His name, sending to them a preacher of the truth, a lamp of salvation, and calling them His people which were not His people, and them beloved which were not beloved, and them as having obtained mercy which had not obtained mercy. Then the holy bishop began to ordain presbyters, to consecrate bishops, to distribute the other dignities of the ecclesiastical orders, and to divide the whole land into parishes with fixed bounds. Finally, having confirmed, in faith and good works, his children whom he had begotten in Christ, and having set in order all things which seemed to be necessary to the honour of God and for the salvation of souls, he bade farewell to the brethren, and returned to his own church, where in great tranquillity of soul, he spent a life perfect in all sanctity and glorious in miracles.
— Vita Sancti Niniani, vi.