I think it's interesting that these blind guys use the word mercy and not grace. I mean, they want Jesus to heal them, even though they don't deserve it, so they were asking him to show them grace. I wonder why they used mercy, then? There has to be a meaning to it, I'm just not sure what it could be.
It's cool that Jesus felt sorry for them and healed them. I think that might be the key to getting God to seeing God answer a prayer request. We will never be able to earn anything from God and will never receive anything because we deserve it. So basically, we're just trying to get God to have mercy on us and feel sorry for us. Kind of changes your perspective on prayer. JM