Sin Blotted Out

Psa 51:1 Have mercy upon me, O God, according to thy lovingkindness: according unto the multitude of thy tender mercies blot out my transgressions.

Psa 51:2  Wash me throughly from mine iniquity, and cleanse me from my sin.

Psa 51:3  For I acknowledge my transgressions: and my sin is ever before me.
 
A boy ran in to his mother one day after he had read that promise, "I will blot out, as a thick cloud, thy transgressions." 

And he said: "Mother, what does God mean when He says He will blot out my sins?

What is He going to do with them? 

I can't see how God can really blot them out and put them away.

What does it mean...blot out?

The mother, who is always the best theologian for a child, said to the boy, "Didn't I see, you yesterday writing on your slate?" 

Yes, he said.

Well, show it to me. He brought his slate to his mother, who, holding it out in front of him, said, "Where is what you wrote? 

Oh, he said, "I rubbed it out."

Well, where is it?

Why, mother, I don't know.

But how could you put it away if it was really there?

Oh, mother, I don't know. I know it was there, and it is gone. 

Well, she said, "that is what God meant when He said, 'I will blot out thy transgressions.'" 

~Campbell Morgan~