Lets look at some of the objects around the Cross and try to gain some understanding.
Jesus was nailed to the cross.
When you were dead in your sins and in the uncircumcision of your sinful nature, God made you alive with Christ. He forgave us all our sins, having canceled the written code, with its regulations, that was against us and that stood opposed to us; he took it away, nailing it to the cross. Colo 2:13,14
So what does this teach us? God nailed the written code that was against us on the cross.
So the next time you remember your past sins, remember the nails. Your long list of iniquity and sins has been nailed to the cross and washed by the blood of Jesus. Nail this point down to your heart, so that you will be free from guilt.
Next time, when the devil comes with to make you guilty, show the nails and nail him down. :)