In author Ian MacDonald's view, some critics have overemphasised the extent of McCartney's optimism in the song and neglect the toughness in passages written by McCartney, such as "Do I have to keep on talking until I can't go on?" Lennon's middle shifts focus from McCartney's concrete reality to a philosophical perspective in B minor, illustrating this with the waltz-like passage suggested by Harrison that leads back to the verse, possibly meant to suggest tiresome struggle. Rather than a formal change to time, the waltz effect is created through suspensions and triplets within the regular rhythm.