Christian duties to live legally before God.

Romans 12
12 So, brothers, I beg you for the mercies of God, that you present your bodies in living sacrifice, holy, pleasing to God, which is your rational cult.
2 Do not conform to this century, but transform yourself through the renewal of your understanding, so that you can see what the good will of God is, pleasant and perfect.
3 I say, therefore, by the grace that is given to me, to each one who is among you, that he has no higher concept of himself than he must have, but that he thinks of himself with sanity, according to the measure of faith that God distributed to each one. (RVR1960)

The Bible is our life manual and it contains our principles which allow us to educate ourselves to live a legal life before God and men.
The apostle Paul used this passage to explain to the church that they should keep biblical principles as Christian duties and thus differentiate themselves from the world and walk legally before God.

Source

First I advise that the true worship of God was to keep their bodies pleasant and holy and not practice the things of the world by adjusting to their currents.

Second he asked them not to conform to the things they saw of this century but rather that they would be transformed day by day by renewing their mind through the word of God so that they could obtain wisdom and understand the will that God had for them.

The good news is that we have all acquired the grace of God so that we may think with sanity and make the most of his compassion for us and walk in his grace that is his perfect and pleasant will.

All of us are called to keep the Christian duties established in the word in order to have the moral to pray to God and receive his help.
When we walk legally on their paths with nothing to hide we will truly become more than conquerors in Christ Jesus and therefore we will become more than victorious in everything we undertake, there is no hidden life for God, because He knows everything and scrutinizes the deepest of our being.