What is the meaning of the poem "Out Out" by Robert Frost?

‘"Out, out, brief candle!" This line is spoken by Macbeth in Act 5, Scene 5, upon learning of the death of his wife, Lady Macbeth. The phrase **signifies his despair and the fleeting nature of life, comparing human existence to a brief candle flame that is extinguished**.’ That’s just straight from Google, and I think Robert Frost is just giving a very prosaic, contemporary American example of the nature of human existence, in general, that Shakespeare has made tragic in Macbeth. Frost is generalizing this principle to all human beings, not just tragic heroes or villains. https://www.quora.com/unanswered/What-is-the-meaning-of-the-poem-Out-Out-by-Robert-Frost