After establishing in the previous two sonnets that he is possessed of a 'fever' that makes him 'mad' and that distorts his vision, William Shakespeare uses Sonnet 149 to further describe the effect this love for his mistress is having on him. So much is he in her thrall that no-one whom she hates he can love, no-one she admires he may disdain. Just a glance of her eyes, and he will obey. And yet, in spite of all this, she loves him not but pursues other lovers who are not so blinded by love as he.