All Nature wears one universal grin.

Fielding’s line personifies the natural world as if it were a single face, smiling everywhere at once. The “universal grin” suggests a moment when the landscape appears harmoniously animated—sunlight, growth, and fair weather combining to produce an atmosphere of shared cheer. In Fielding’s comic imagination, such a description often works as more than scenery: it sets an emotional key for the episode, implying that human troubles are temporarily suspended or rendered smaller by the buoyant, restorative mood of the outdoors. The phrase also hints at an Enlightenment-era confidence in nature’s order and benevolence, presenting the world as fundamentally welcoming rather than hostile.