How blessed is the one who receives a receipt instead of an invoice for their sins. Romans 4:8 (Mirror Bible)

An invoice is a record of a debt which must be paid.
A receipt is the proof one has when a debt has been paid off.

Are we in a state of still owing debt since the Cross? Did Jesus not pay the full price of our redemption?
Is there still some work we must do to pay off our debt of sin?

Religion says yes! You must do penance to remediate your fallen estate. There are specific prescribed actions you must take to make amends. You are hopelessly lost in your sinful state unless you follow all the rules and do all the things. The bill (invoice) must be paid in full.

But Jesus, says I paid the full price of your redemption and I’ve already given you a receipt signed in my blood. We are released from the burden of our sin debt. That whole deal has been settled and our job is to share the good news that the cross was for everyone.

We are free from the bondage of the sin and guilt that fuels the religious system.