The second part of "The Seafarer" contains many references to the speaker's relationship with god. God is an entity to be feared. He is the Creator:
He turns the earth,
He set it swinging firmly in space,
Gave life to the world and light to the sky.
In return, god expects men to remember him.
Death leaps at the fools who forget their God.
He who wants to live forever must "live humbly." He must not be overly concerned with material wealth. He must not harm others even if wrong is done to him. These tenets sound very similar to Jesus' "Do unto others as you would have them do unto you" or "Turn the other cheek."
God is mighty and capable of giving us eternal life. But if we get caught up in the riches of the world, if we forget to live humbly or if we forget to praise our god, we will not have the "hope of Heaven." or "eternal joy."