An old pair of shoes can be the most comfortable thing in the world.
However, the shoes have to be broken in to fit perfectly.
One will have to endure painful blisters and bleeding before reaching the desired comfort.
Well, that's it. New shoes make you bleed.
There is simply no need to 'metaphor'ise everything.
Inspiration? Well, m'new shoe's makin' me bleed, so I thought I'd enlighten y'all with this fact.