No more consciousness of sins

Hebrews 10:1-4
New King James Version (NKJV)

Animal Sacrifices Insufficient

10 For the law, having a shadow of the good things to come, and not the very image of the things, can never with these same sacrifices, which they offer continually year by year, make those who approach perfect. 2 For then would they not have ceased to be offered? For the worshipers, once purified, would have had no more consciousness of sins. 3 But in those sacrifices there is a reminder of sins every year. 4 For it is not possible that the blood of bulls and goats could take away sins.

All the offering of the Old Testament are shadows of the substance. Jesus is the substance. If the Substance is here why do we need to go for shadow?

• The burn offering
• The meal offering
• The peace offering
• The sin and trespass offering

Once in Greek hapax , once for all
http://biblehub.com/greek/530.htm

Perfect not pertaining to our behaviour, Perfect in our conscience

Hebrews 9:9-10
New King James Version (NKJV)

9 It was symbolic for the present time in which both gifts and sacrifices are offered which cannot make him who performed the service perfect in regard to the conscience— 10 concerned only with foods and drinks, various washings, and fleshly ordinances imposed until the time of reformation.