Which literary figure is associated with the phrase "the best laid schemes o' mice an' men"?

The phrase "the best laid schemes o' mice an' men" is indeed attributed to Robert Burns. It originates from his poem "To a Mouse," written in 1785. In this poem, Burns reflects on the unpredictability of life and the ways in which even the most carefully planned efforts can go awry, using the metaphor of a mouse whose nest has been disturbed. The line encapsulates the theme of the poem, highlighting the contrast between human ambition and the reality of circumstances beyond one's control. This phrase has since entered popular literary discourse as a reminder of the fragility of plans and intentions, thus making it strongly associated with Burns' work. The other authors listed, such as Robert Frost, William Wordsworth, and John Milton, are renowned for different themes and styles in their own poetry, but none are linked to this particular phrase.