Doubt vs Unbelief

I've had doubts... Big doubts... Wanting to scream at God doubts.

But I don't think this is the same as unbelief.

For, doubt says that I don't understand. 

I don't understand something about the circumstances I find myself in. 
I don't understand how to reconcile an event with the character of God. 
I don't understand a concept described in the bible.

Doubt comes with humility and searching.

Unbelief, on the other hand, says that I won't believe.

Despite what the bible says, I won't believe.
Despite evidence to the contrary, I won't believe.
Despite my experience and the experiences of others, I won't believe.

Unbelief comes with pride and stubbornness.

I believe that God is more than big enough for doubt and welcomes those who hold a healthy balance of faith and doubt.

But, unbelief, just like the out working of all sin and rooted in self-idolatry, declares that we know better than God and place ourselves upon the mantelpiece of our lives.