It is a beckoning from powers outside mankind.
It is not even the establishment of commerce by sea which takes a people to sea. Nothing more likely than for a nation to become a nation of transport and yet to see its crews gradually becoming foreign, as its own people grew to dislike the nasty but mysteriously summoning business of wet decks and thumping. It certainly is not proximity to the sea that does the trick. You have all over the world great lumps of population, millions and millions, right on to the sea, who never take to it, but leave a fringe of foreigners to do their sailing. Witness the Slavs. And though, of course, it is true that inland nations are not seafaring nations, the real reason is much more that they choose to be inland than that they happen to be inland.
I have asked myself often enough why the old Egyptians did not take to the sea. Perhaps they did very long ago, but at any rate the memory of it has died out. The other people who traded with them from the North have not even legends of Egyptians coming to them. We have no stories or inscriptions of Egyptians common in the harbours of the Mediterranean. And yet they had a great river going straight out to sea and a coast that for thousands of years, in the height of their power, invited them. They had ships, no doubt, which were sea-going. We know of fleets, but we are not always certain that they were Egyptian fleets, even when they were fleets under the command of the Egyptian king. What we have not got is an Egyptian maritime legend or tradition.
On the other hand, you find an enormous, volcanic, seafaring energy just where it should not be--on the harbourless coast of the Levant. And it seems certain, to me reading, that those seafarers who kept it up for centuries, the people of Tyre and Sidon, were driven by masterful instinct. It seems possible or even probable that they started from some little islands in the Persian Gulf, and that, for some reason, they came all this way across desert land and began again from other little islands hundreds of miles away upon another sea. Once they had started from the Levantine coast they did everything that the sea makes one do. They explored, and they named. They must have felt the fun of the thing. Commerce can only have been their second motive, though naturally it is the motive _we_ put first to-day.