The poem begins by explaining itself, then immediately pulls the explanation away. The speaker first says the poem is about losing their temper and saying hurtful things they regret. Then comes the blunt line "That's a lie." It reads like someone admitting that the neat, confessional answer was easier to give than the truth, or perhaps a way of hiding behind a shrug.
From there the speaker spirals into bleak logic: nothing has meaning because everything decays. Rock cracks, blades rust, and even the mind "will rot and tear itself apart." That last image feels personal, as if the speaker's own thoughts are what they fear most. The only thing left standing is time.
The mood is cold and fatalistic, but the poem's opening hints at something more fragile underneath. Declaring that nothing matters can be a way of coping with regret. The short, flat final line sounds calm, yet it lands like a door closing.