[Waldo] Williams, who was a Quaker and pacifist, saw poetry as “an extension of the light which put the world together    …    I felt an unreasonable unity between the thing and the name.” He here draws attention to the theology of intricate sound patterns. If words in various combinations make music then one might infer that those objects to which words refer are also interrelated. This holds for end rhymes, such as the famous womb/tomb or wind/mind combinations and also for more subtle echoes within a poetic line. Going back to the elegy for the Prince of Wales, if “gwir” (the truth) and “ymgyweiriaw” (tuning) share sounds then they’re also mutually implicated in the world.

Gwyneth Lewis, “Extreme Welsh Meter”