I would say that it is God's will that our lives reflect the heart of the one who wrote. I wouldn't say it is God's will for us to obey the Law in the sense of living in subjection to it. I believe He preaches it because it is the evidence of God's heart that His audience has in their possession, and He wants them to honor God's heart.
I agree, our heart should reflect the one who wrote it.
Eph 5:2 And walk in love, as Christ also hath loved us, and hath given himself for us an offering and a sacrifice to God for a sweetsmelling savour.
Eph 5:3 But fornication, and all uncleanness, or covetousness, let it not be once named among you, as becometh saints;
Eph 5:4 Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.
Eph 5:5 For this ye know, that no whoremonger, nor unclean person, nor covetous man, who is an idolater, hath any inheritance in the kingdom of Christ and of God.
Eph 5:6 Let no man deceive you with vain words: for because of these things cometh the wrath of God upon the children of disobedience.
Eph 5:7 Be not ye therefore partakers with them.
Eph 5:8 For ye were sometimes darkness, but now are ye light in the Lord: walk as children of light:
Eph 5:9 (For the fruit of the Spirit is in all goodness and righteousness and truth
Eph 5:10 Proving what is acceptable unto the Lord.
Eph 5:11 And have no fellowship with the unfruitful works of darkness, but rather reprove them