This line begins the poem off by asserting that love will be a dominant theme. It does this by speaking of the love of him and his wife in the first line. The speaker feels that if any couple could truly be one it would be him and his spouse. This starts off the poem by allowing the reader to immediately understand the severity of his love. This way it shows the importance of love throughout the poem from the start.
If ever two were one, then surely we.
This line solidifies the trust the husband has in his wife. He insinuated that if any wife truly loved their husband it would be his. This builds the theme of love. It also allows the reader to now realize that the husband has full faith in his wife's love. This line is important because of its placement in the poem. The first and second line of this poem allow the reader to almost immediately identify the theme.
This line is the following line after the turn in the poem. It allows the reader to understand that although the husband cannot repay the love she gives, he wants her to receive some form of compensation. It also brings a religious aspect to the poem by using religion to extend the theme of love. He appreciates the love given by his wife and wants her to receive full repayment. He wishes deeply that he could repay her undeniable love, but resorts to religion to help him repay her. This continues exaggerating and expressing the deep love his wife gives him.
If ever man were loved by wife, then thee
This poem uses a hyperbole in order to further elaborate and build on the theme of love. "I prize thy love more than whole mines of gold, Or all the riches that East doth hold." This statement is obviously a major exaggeration but it is used appropriately. It allows the reader to understand the unrealistically large amount of love the two have for each other. It also continues on with the theme of love while increasing the extent of it.
The turn in line 9 takes a more somber tone while still maintaining the overall theme of love. Before line 9 the speaker focuses on how unconditionally his wife loves him. He also focuses on how much he values her love. When the turn comes on line 9 the mood becomes somber because he admits that he cannot repay her for the love she gives. This lets the reader understand the sincerity of his wife's love. It also allows the reader to see how appreciative the husband is while still not being able to fully repay her. After this turn the poem becomes less lighthearted and more serious about the love at hand.
Thee heavens reward thee manifold, I pray.
This line after the turn is a great way of finishing off the poem. This line allows the reader to come to peace knowing that the husband and wife will continue loving each other. The husband may not be able to repay the love but he does want him and his wife to preserve their love no matter the hardships ahead. This line is a line away from the end and is a great solitifier of the theme. This line is important and is needed because it gives the reader a sense of closure and puts the somber mood to rest.
Then while we live, in love let's so preserver.