The third section moves the perspective of Ulysses' perceptions. Ulysses addresses to "the silent listeners", the mariners. The word "my" points out his closeness to them. Therefore they are "souls", not human being as the savage people (it marks sailors' superiority). They worked hard and thought with Ulysses (hardship is marked by the use of "toiled and wrought"). What's more they have faced difficulties with joy. The alliterative sound of "f" in the line 49 reminds the wind.
After that Ulysses states that the sailors and he are old: death is coming ( "the lights begin to twinkle from the rocks"; "the long day wanes", " the slow moon climbs and "the deep Moans" (the sea is personified)l. 54,55 56) and it will close all. As a consequence he invites his friends to seek a newer world, because it is not too late and according to him they should exploit what remains. His aim is "to sail beyond the sunset, and the baths of all the western stars", that means that he wants to make experiences beyond the old age, beyond the time remaining, until he dies. He hopes that after death he shall touch the "happy Isles" (island of the Blessed, a paradise of perpetual summer) and meet Achilles (one of the most heroic figure in Greek myth). In any case, until he lives, he will be "strong in will to strive, to seek, to find and not to yield" even if he is made weak by the time passing. Therefore the extract ends with Ulysses' invitation not to yield, but to fight for purposes.