As opposed to most of his sonnets, which have a "turn" in mood or thought at line 9, (the beginning of the third quatrain (See: Sonnets 29, 18) the mood of Sonnet 66 does not change until the last line, when the speaker declares that the only thing keeping him alive is his lover. This stresses the fact that his lover is helping him merely survive, whereas sonnets 29 and 30 are much more positive and have 6 lines in which they affirm that the lover is the fulfillment of the poet's life