"Impure" is only two lines long, but it packs a lot into them. The speaker describes how insecurities get "coated in pride," like a hard shell painted over something soft and shaky. What looks like confidence is really cover for self-doubt. The second line goes a step further: self-defence is "veiled" self-destruction. The ways we protect ourselves, such as acting tough, pushing people away, or refusing to show weakness, can quietly hurt us most.
The speaker doesn't sound angry so much as clear-eyed and a little weary. There's a sense of honest self-recognition here, as if they've caught themselves in the act. The title, "Impure," suggests that these motives are mixed up and tainted, neither fully strength nor fully weakness. The missing punctuation and the clipped phrasing make the mood stark and uneasy. Nothing is explained or comforted, so the reader is left with the uncomfortable thought that protecting yourself and wrecking yourself can look almost identical.