Chapter 1: the cobbler's son

my name was tommy stubbins, son of jacob stubbins, the cobbler of puddleby-on-the-marsh; and i was nine and a half years old. at that time puddleby was only quite a small town. a river ran through the middle of it; and over this river there was a very old stone bridge, called kingsbridge, which led you from the market-place on one side to the churchyard on the other.

sailing-ships came up this river from the sea and anchored near the bridge. i used to go down and watch the sailors unloading the ships upon the river-wall. the sailors sang strange songs as they pulled upon the ropes; and i learned these songs by heart. and i would sit on the river-wall with my feet dangling over the water and sing with the men, pretending to myself that i too was a sailor.

for i longed always to sail away with those brave ships when they turned their backs on puddleby church and went creeping down the river again, across the wide lonely marshes to the sea. i longed to go with them out into the world to seek my fortune in foreign lands—africa, india, china and peru! when they got round the bend in the river and the water was hidden from view, you could still see their huge brown sails towering over the roofs of the town, moving onward slowly—like some gentle giants that walked among the houses without noise. what strange things would they have seen, i wondered, when next they came back to anchor at kingsbridge! and, dreaming of the lands i had never seen, i'd sit on there, watching till they were out of sight.

which of the following best states a key theme of the excerpt "the cobbler's son"?