Why does Montaigne hesitate to guess whether there are additional countries to be discovered?

He saw that there were still vase land at the coast of the westward.

Explanation:

Montaigne was considered or known to be a Portuguese explorer, who set out on a mission in September, 1517 to discover the world. This mission was made known to have been sponsored by the Spanish government.

Although he died at the Philippines where he was killed, but one of his fleet ships was able to return safely.

It was made known that he discovered a large land at the coast of Westward, where he concluded that there might still be additional countries yet to be discovered.