Deuteronomy 4

In one of his final discourses, Moses tells his people -

"NOW therefore hearken, O Israel, unto the statutes and unto the judgments, which I teach you, for to do them, that ye may live, and go in and possess the land which the LORD God of your fathers giveth you."  (Old Testament | Deuteronomy 4:1)

Moses even counseled -

"Ye shall not add unto the word which I command you, neither shall ye diminish ought from it, that ye may keep the commandments of the LORD your God which I command you."  (Old Testament | Deuteronomy 4:2)

John the Revelator wrote much the same thing -

"For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book..."  (New Testament | Revelation 22:18)

Both comments suggesting, don't try to make your own personal interpretations of their writings whereby you strive to justify your own unrighteous actions.  One of the main reasons Moses suggest to keep the commandments in this new promised land was -

"Keep therefore and do them; for this is your wisdom and your understanding in the sight of the nations, which shall hear all these statutes, and say, Surely this great nation is a wise and understanding people.
7 For what nation is there so great, who hath God so nigh unto them, as the LORD our God is in all things that we call upon him for?
8 And what nation is there so great, that hath statutes and judgments so righteous as all this law, which I set before you this day?"  (Old Testament | Deuteronomy 4:6 - 8)

These people were to be an example to all nations by evidence of their obedience that their God was God.  Not only were they to be an example to all nations but teach and testify of these things to their children that they would do the same thing as Moses counseled -

"...take heed to thyself, and keep thy soul diligently, lest thou forget the things which thine eyes have seen, and lest they depart from thy heart all the days of thy life: but teach them thy sons, and thy sons' sons;
10 Specially the day that thou stoodest before the LORD thy God in Horeb, when the LORD said unto me, Gather me the people together, and I will make them hear my words, that they may learn to fear me all the days that they shall live upon the earth, and that they may teach their children."  (Old Testament | Deuteronomy 4:9 - 10)

Is there a better way to teach than by example?