Just like the priests were sprinkled {as Moses sprinkled the priests} with blood [MET] to symbolize that they were no longer guilty for having sinned, we also no longer are guilty for having done evil. Just like the priests ceremonially washed their bodies with pure water to prepare themselves to serve God, we are allowing God to continually make us pure. So, we (inc) must approach God sincerely by confidently trusting in him.