Here are the few paragraphs from the book,

The heroic discovery of America, at the close of the fifteenth century after Christ, has compelled the generous and just admiration of the world; but the grandeur of human enterprise and achievement in the discovery of the western hemisphere has a less claim on our admiration than that divine wisdom and controlling providence which, for reasons now manifested, kept the secret hidden through so many millenniums, in spite of continual chances of disclosure, until the fullness of time.

How near, to "speak as a fool," the plans of God came to being defeated by human enterprise is illustrated by unquestioned facts. The fact of medieval exploration, colonization, and even evangelization in North America seems now to have emerged from the region of fanciful conjecture into that of history. That for four centuries, ending with the fifteenth, the church of Iceland maintained its bishops and other missionaries and built its churches and monasteries on the frozen coast of Greenland is abundantly proved by documents and monuments. Dim but seemingly unmistakable traces are now discovered of enterprises, not only of exploration and trade, but also of evangelization, reaching along the mainland southward to the shores of New England. There are vague indications that these beginnings of Christian civilization were extinguished, as in so many later instances, by savage massacre. With impressive coincidence, the latest vestige of this primeval American Christianity fades out in the very year of the discovery of America by Columbus.