The book of Roman's is largely a book of doctrines, from Chapter 1 - 11. From chapter 12 - 15 is about practical Christian living or the outworking of doctrine in the lives of Christians. We need to note that doctrine is never taught in the Bible simply to be a matter of knowledge acquisition. So, we need to beware, after a lifetime of learning about God, in Sunday school, church services etc. are we putting those into practice? In John 13:17 Jesus said "...blessed are you if you do them". Therefore knowing all about God and His mercies obligates us to do something about it. Knowing that we were forgiven, justified by faith, God says through Paul, 'Offer your bodies as living sacrifices'.
We need not give any more animal sacrifices, but the sacrifice of obedience (1 Sam 15:22), the sacrifice of thanksgiving and praise! But remember that sacrifice must be given in humility, because our our goodness is not good enough. Isaiah 64:6 says our righteousness is like filthy rags. It is the righteousness which God imputes (gives) us by His mercy which again enables us to offer our sacrifice. This should keep us humble and sane! So, start with what you have - your body! remember that sacrifice must be given in humility, because our goodness is not good enough. Isaiah 64:6 says our righteousness is like filthy rags. It is the righteousness which God imputes (gives) us by His mercy which again enables us to offer our sacrifice. This should keep us humble and sane! So, start with what you have - your body! Remember two things, first, that we are purchased (1 Cor.6, 19, 20). Secondly, we are raised with Christ to a new life - a new reality! (Rom 6:10, 11). In Roman Chapter 6, Paul affirmed the effect of the death and resurrection of Christ in the life of a believer, 'we died with Christ...we live with Him', so do not offer your body as "instruments of wickedness...but as instruments of righteousness" Rom.6: 13.
The word sacrifice means, to surrender, to give up or to offer something of value! Because of our new identity, because we are obligated, because we are committed to a new master and the master needs it (story of the donkey on Palm-sunday.Mark 11). In this life people give up food to get slim, sleep to succeed in life, offer things of value to those they love or respect. How much more should we not give God? Paul does not stop with our bodies, but he goes on to say - offer your minds (12: 2) and then your gifts, abilities and talents (12:6 - 8). He also reminds Christians to know that we live in a sinful world and age, so make a conscious effort not to conform to it - but rather be transformed, meaning, to be changed from the inside out. We can picture the amazing phenomenon of Metamorphosis which happens in nature, of how a caterpillar changes into a butterfly, or a tadpole into a Frog! So also us we who believe in Christ, we have become transofremd into new creatures (2 Cor.5:17). Thus let us daily offer ourselves and our all to God - and then His will also becomes clearer day by day! Thus, let us live for Jesus!