Lay Aside the Weight of Insecurity

I've been struck recently by the way insecurity manifests itself in different ways.  Someone can appear classically insecure by appearing as a shrinking violet, not volunteering and putting themselves down.   On the other hand others can manifest insecurity by talking a lot, never admitting they're wrong/not sure/in difficulty and generally appearing to be really confident.  

What's going on there and what's a gospel-of-grace solution?  

This article by Jon Bloom is good and I particularly like the bullet pointed list of how we can apply the Gospel to particular facets of insecurity.  Worth a read.