The Blood of Jesus is powerful in that it is the only agent able to cleanse and remove the stain of sin in mankind. When Adam sinned, the universe was altered. Man, originally meant to have fellowship and intimacy with God, was suddenly separated from Him. But God, through the system of sacrifices, which covered and atoned for sin, offered a temporarily restored fellowship. Jesus came, once and for all, through the shedding of His own sacrificial blood, to pay a debt He didn't owe, to cancel the eternal debt of sin that we could never pay. It's His blood that not only cleanses us from sin, but clears our consciences as well.