Don Henry, son of King John I., the most skilful prince of that age in the mathematics, was he who attempted the discovery of those seas, and undertook to double the Cape of Good Hope, upon the account of traffic, which he desired to establish betwixt the crown of Portugal and the emperor of Ethiopia, commonly called Prester John. This enterprise having succeeded, the kings of Portugal, Alphonso V., John II., and Emanuel I., followed it so happily, that, by little and little, they completed the passage to the Indies. This was the course that Father Xavier held with the fleet of Portugal. He found himself sufficient employment, during the time of the navigation: his first study was to put a stop to those disorders which are commonly occasioned by an idle life on ship-board; and he began with gaming, which is the only recreation, or rather the whole employment, of the seamen. That he might banish games of chance, which almost always occasion quarrels and swearing, he proposed some little innocent diversions, capable of entertaining the mind, without stirring up the passions. But seeing that, in spite of his endeavours, they were bent on cards and dice, he thought it not convenient to absent himself, but became a looker on, that he might somewhat awe them by his presence; and when they were breaking out into any extravagance, he reclaimed them by gentle and soft reproofs. He shewed concernment in their gains, or in their losses, and offered sometimes to hold their cards. There were at least a 'thousand persons in the Admiral, men of all conditions: the father made himself all to all, thereby to gain some to Jesus Christ; entertaining every man with such discourse as was most suitable to his calling. He talked of sea affairs to mariners, of war to the soldiery, of commerce to merchants, and of affairs of state to men of quality. His natural gaiety, and obliging humour, gained him a general esteem; the greatest libertines, and most brutal persons, sought his conversation, and were even pleased to hear him speak of God. He instructed the seamen daily in the principles of religion, of which the greater part were wholly ignorant, or had at the best but a smattering of it; and preached to them on every holiday, at the foot of the main mast. All of them profited by his sermons, and in little time nothing was heard amongst them, which was offensive to the honour of God, or that wounded Christian charity; or touched upon obsceneness, or ill manners. They had a profound veneration for him; with one word only, he appeased their quarrels, and put an end to all their differences. The viceroy, Don Martin Alphonso de Sosa, invited him from the very first clay to eat at his table; but Xavier humbly excused it, with great acknowledgments, and during all the voyage lived only on what he begged about the ship.