Please explain these lyrics to me: 

Blood and glitter, sweet and bitter
We're so happy we could die
Blood and glitter
What we are is but a choice
A promise to ourselves
We are free to break and change
Never forget? Let it go
This or that? No need to know
Whether above or below
We are all from the same blood
Blood and glitter, sweet and bitter
We're so happy we could die
Blood and glitter, sweet and bitter
We're so happy we could die
Blood and glitter, saint and sinner
We do fall before we rise
Now go, go, let your blood flow, flow
With broken wings, we learn to fly
We are blood and glitter
NAME_1 your head up in the clouds
With two feet on the ground
Life's too fast so make it count
Never forget? Let it go
This or that? No need to know
Whether above or below
We are all from the same blood
Blood and glitter, sweet and bitter
We're so happy we could die
Blood and glitter, saint and sinner
We do fall before we rise
Now go, go, (let your blood) flow, flow
With broken wings, we learn to fly
We are blood and glitter
Go, go, let your blood flow, flow
Blood and glitter
Go, go, let your blood flow
Blood and glitter, sweet and bitter
We're so happy we could die
Blood and glitter, sweet and bitter
We're so happy we could die
Blood and glitter, saint and sinner
We do fall before we rise
Now go, go, let your blood flow, flow
With broken wings, we learn to fly
We are blood and glitter
Blood and glitter