the.com/guiding light

The person or idea you steer by when everything else is fog.

means A person, principle, or ideal that provides direction and inspiration for someone's actions or decisions.

from A straightforward compound built from 'guide' (from Old French 'guider,' tracing back to a Germanic root meaning 'to show the way') and 'light,' long used metaphorically for understanding, truth, and hope — think of 'seeing the light' or enlightenment itself. The phrase draws its real power from literal guiding lights: lighthouse beams, beacon fires, and lanterns that sailors and travelers steered by to avoid wreck in the dark. The metaphor transferred naturally — just as a physical light marks safe passage through literal darkness, a 'guiding light' marks the way through confusion or hardship.

origin
Lighthouses literally kept ships off rocks
irony
Often praised only in retrospect, after the storm
overuse
Eulogies and graduation speeches cannot quit it
reality check
Even lighthouses need someone to maintain them
the.com · every word