Lyric discussion by CantStopTheBug 

IMHO, the song is about the negative thoughts a person has when one feels he/she is about to be replaced (whether by another lover or by someone who's better at something this person does etc.), and the singer advises not to dwell in such thoughts.

The negative thoughts are symbolized by the bitter vulture in the 1st verse, the twisted strings in the 2nd, the spitting voices mentioned in the bridge, and the reactions in the 3rd verse. The 1st verse even suggest that these thoughts were once sympathetic but then changed into something more forceful ("the weeps turn quick into bullying").

Apparently, these thoughts were "easy to see", and the singer tells the person to "stop listening" to it, to "just let it go" because it will hold and set the person back, as stated in the chorus. Also, the singer is willing to help out since he "brought enough stones" so that they can both throw at the voices. The chorus seems to imply that he has advised this person more than once, and he's apologetic that he/she had to hear him again and again. Or the line "I'm sorry" could mean the singer empathizes with the person's situation.

Anyway, I've only heard a handful of SSPU songs, and this so far, I think, is their best one. Plus its overall mellow tone makes it good driving music.

I dig your interpretation. It feels right.

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