Deuteronomy 6:18

18 and do thou that that is pleasing and good in the sight of the Lord, that it be well to thee (so that it shall be well with thee), and that thou enter, and wield the best land, of which the Lord swore to thy fathers,

Deuteronomy 6:18 Meaning and Commentary

Deuteronomy 6:18

And thou shalt do that which is right and good in the sight of
the Lord
And what is such appears from the declaration of his mind and will in the commandments he has given, and obeying which is therefore doing what is right and good; for his commandment is holy, just, and good, being agreeable both to his nature and will, ( Romans 7:12 ) that it may be well with thee; as it is with those that fear God, and keep his commandments:

and that thou mayest go in and possess the good land which the Lord
sware unto thy fathers;
to give to them and to their posterity, even the land of Canaan; but if they did not what was right and good in the sight of God, they might expect to be kept out of it, as their immediate parents were, whose carcasses fell in the wilderness.

Deuteronomy 6:18 In-Context

16 Thou shalt not tempt thy Lord God, as thou temptedest him in the place of tempting. (Thou shalt not tempt the Lord thy God, as thou temptedest him at Massah.)

17 Keep thou the commandments of thy Lord God, and the witnessings, and ceremonies, which he hath commanded to thee; (Obey thou the commandments of the Lord thy God, and his testimonies, and statutes, which he hath commanded to thee;)

18 and do thou that that is pleasing and good in the sight of the Lord, that it be well to thee (so that it shall be well with thee), and that thou enter, and wield the best land, of which the Lord swore to thy fathers,

19 that he should do away all thine enemies before thee, as he hath spoken. (and that he would do away all thy enemies before thee/and that thou would do away all thy enemies before thee, as he hath promised.)

20 And when thy son shall ask thee tomorrow, that is, in time to coming, and shall say, What will these witnessings, and ceremonies, and dooms to themselves, which our Lord God commanded to us? (And when thy son, or thy daughter, shall ask thee tomorrow, that is, in the time to come, and shall say, What is the meaning of these testimonies, and statutes, and laws, or judgements, which the Lord our God hath commanded us to obey?)