Malachi 1 teaches us that our sacrifices need to be acceptable to the Lord. Scripture teaches us that one of our sacrifices is our bodies.
I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
The New King James Version (Nashville: Thomas Nelson, 1982), Ro 12:1–2.
God has asked us to present our bodies as a living sacrifice. A holy sacrifice, one that is acceptable to God. Our body is the temple of the Holy Spirit. A believer's sacrifice is his total life to God. It should be a desirable response of the believer. We are to no longer conform to the patterns of this world but be transformed by the renewing of your mind.
The Greek word translated transformed is seen in the English word metamorphosis which is a total change from the inside out. The key to this change is the “mind” (noos), the control center of one’s attitudes, thoughts, feelings, and actions (cf. Eph. 4:22–23). As one’s mind keeps on being made new by the spiritual input of God’s Word, prayer, and Christian fellowship, his lifestyle keeps on being transformed.