But a revelation from Heaven and the working of God prevented him from achieving either of these enterprises; for when he had made choice of most courageous companions, fit to preach the Word, inasmuch as they were renowned for their good deeds and their learning, and when all things necessary were provided for the voyage, there came to him on a certain day early in the morning one of the brethren, who had been a disciple of the priest, Boisil,(816) beloved of God, and had ministered to him in Britain, when the said Boisil was provost of the monastery of Mailros,(817) under the Abbot Eata, as has been said above.(818) This brother told him a vision which he had seen that night. “When after matins,” said he, “I had laid me down in my bed, and was fallen into a light slumber, Boisil, that was sometime my master and brought me up in all love, appeared to me, and asked, whether I knew him? I said, ‘Yes, you are Boisil.’ He answered, ‘I am come to bring Egbert a message from our Lord and Saviour, which must nevertheless be delivered to him by you. Tell him, therefore, that he cannot perform the journey he has undertaken; for it is the will of God that he should rather go to teach the monasteries of Columba.’ ”(819) Now Columba was the first teacher of the Christian faith to the Picts beyond the mountains northward, and the first founder of the monastery in the island of Hii, which was for a long time much honoured by many tribes of the Scots and Picts. The said Columba is now by some called Columcille, the name being compounded from “Columba” and “Cella.”(820) Egbert, having heard the words of the vision, charged the brother that had told it him, not to tell it to any other, lest haply it should be a lying vision. But when he considered the matter secretly with himself, he apprehended that it was true, yet would not desist from preparing for his voyage which he purposed to make to teach those nations.