Blackleaf is making a point about metaphysical inconsistency. If Jesus self-sacrifices, then in imitation of Jesus, Christians should self-sacrifice. Pretty simple really. And in the age of martyrs, Christians still understood this. But after Constantine, not so much. Then it became fashionable to theologize that Jesus was the one and only necessary sacrifice, that martyrdom was no longer necessary. As I have pointed out elsewhere, Christianity was turned on its own head in the 4th century.
"Because we're all sinful, that person would inevitably need another sacrifice sometime down the line. So the solution is simple. Either hoard cats or make a permanent sacrifice. One that will cover both past transgressions and those that could be made in the future."
God will only accept a perfect, sinless sacrifice. Only the man Jesus Christ fits that sacrifice, for all sin and for all time. There can be no other sacrifice, that Blackleaf eludes to. Although he would lead you to believe we Christians should make that sacrifice.
For if we sin willfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins."
Blackleaf is twisting the Word of God to suggest something that is impossible.