How does the author go about changing the meaning?

Line 11 is interesting as these two ideas are not usually mutually exclusive: it is possible to love another and oneself. However, Wyatt is perhaps indicating that the relationship is one dictated by the heart rather than the head; though the love feels right, the narrator cannot quiet his mind to the unsettling knowledge that his love is not a practical or logical choice. If he is prepared to put himself in danger for his love, he must not care enough about himself to prevent his own destruction. In the final rhyming couplet, the narrator makes it clear that he understand that that which gives him the most pleasure is that which causes him the most peril.