It was by no means proved that he had discovered the mines of King Solomon; he had never even seen the place which he identified with them; it was in fact nothing more than an idea in his own head; but we may be sure that he took it as an established fact that he had actually discovered the mines of Ophir, and confined his discussion to estimates of the wealth which they were likely to yield, and of what was to be done with the wealth when the mere details of conveying it from the mines to the ships had been disposed of.

So also with the Golden Chersonesus.

The very name was enough to stop the mouths of doubters; and here was the man himself who had actually been there, and here was a sworn affidavit from every member of his crew to say that they had been there too.

This kind of logic is irresistible if you only grant the first little step; and Columbus had the art of making it seem an act of imbecility in any of his hearers to doubt the strength of the little link by which his great golden chains of argument were fastened to fact and truth.
For Columbus everything depended upon his reception by the Sovereigns at this time.

Unless he could re-establish his hold upon them and move to a still more secure position in their confidence he was a ruined man and his career was finished; and one cannot but sympathise with him as he sits there searching his mind for tempting and convincing arguments, and speaking so calmly and gravely and confidently in spite of all the doubts and flutterings in his heart.