3 For we have the record of not a few brave and experienced men, both before and after Christopher Columbus, who with stubbornness and zeal explored unknown lands and seas yet more unknown. And the memory of these, man, mindful of benefits, rightly holds, and will hold in honour; because they advanced the ends of knowledge and humanity, and increased the common prosperity of the race, not by light labour, but by supreme exertion, often accompanied by great dangers. But there is, nevertheless, between these and him of whom we speak, a generous difference. He was distinguished by this unique note, that in his work of traversing and retraversing immense tracts of ocean, he looked for a something greater and higher than did these others. We say not that he was unmoved by perfectly honourable aspirations after knowledge, and deserving well of human society; nor did he despise glory, which is a most engrossing ideal to great souls; nor did he altogether scorn a hope of advantages to himself; but to him far before all these human considerations was the consideration of his ancient faith, which questionless dowered him with strength of mind and will, and often strengthened and consoled him in the midst of the greatest difficulties. This view and aim is known to have possessed his mind above all; namely, to open a way for the Gospel over new lands and seas.
Source: Quarto Abeunte Saeculo (Vatican.va)