It must be a pure sacrifice, springing out of pure motives and extending to a pure goal. The believer's goal is to honor God. All his actions are to honor God. For a believer's spiritual sacrifices to honor God they must be in conformity to His Word. Therefore you must start your priestly work by presenting yourselves as a living and holy sacrifice.
Believers are priests involved in the spiritual service of worship.
That service begins with the presentation of our bodies as a living and holy sacrifice. Every part of the believer's body is to be given in sacrifice to God for holy purposes. Paul disciplined himself that he might present all his faculties to God. God wants a living sacrifice. Abraham took Isaac to Mount Moriah because God told him to take his son and offer him as a sacrifice.