Most of us have had a mortgage. We agree to pay for 20 or 30 years an amount each month until we own the house. It goes on every month, every year. Maybe it is extended because of a need to take out a loan in addition. This is a constant repetition, like a drip from a leaky roof.
Hebrews speaks of the repetitiveness of the priestly service in the temple. Each sacrifice did some good. Like each mortgage payment does some good. But each one had to be repeated. Only the payments were not for 30 years. We can imagine ourselves 30 years down the road from signing our first mortgage papers as being free from the burden. Israel began its sacrifices in the days of Moses and they continued, with a 70 year interruption, down to 70 AD. So for 12 centuries Israel made regular payments on it spiritual debt. Over and over, day after day, year after year, decade and century after another they brought their blood sacrifices to the temple.
God gave this as a gift to his people – it held the promise of forgiveness and peace with God. But it was unending.
Then came Jesus. His sacrifice was complete. It is as if he paid the whole mortgage in one payment. His one payment had paid once for all time the whole debt of the sins of his people.
“For by a single offering he has perfected for all time those who are being sanctified.” Hebrews 10:14