Deuteronomy 30:9-14 promises
The Lord your God will make you abundantly prosperous in all the work of your hand, in the fruit of your womb and in the fruit of your cattle and in the fruit of your ground. For the Lord will again take delight in prospering you, as he took delight in your fathers, 10 when you obey the voice of the Lord your God, to keep his commandments and his statutes that are written in this Book of the Law, when you turn to the Lord your God with all your heart and with all your soul.
11 “For this commandment that I command you today is not too hard for you, neither is it far off. 12 It is not in heaven, that you should say, ‘Who will ascend to heaven for us and bring it to us, that we may hear it and do it?’13 Neither is it beyond the sea, that you should say, ‘Who will go over the sea for us and bring it to us, that we may hear it and do it?’ 14 But the word is very near you. It is in your mouth and in your heart, so that you can do it.”
And Believer Jesus already came to fulfill the Law and the Prophets (Matthew 5:17) He also said all the law hinged on two commandments. Matthew 22:36-40 reads,
“Teacher, which is the great commandment in the Law?” 37 And he said to him, “You shall love the Lord your God with all your heart and with all your soul and with all your mind. 38 This is the great and first commandment.39 And a second is like it: You shall love your neighbor as yourself. 40 On these two commandments depend all the Law and the Prophets.”
And as you note in Deuteronomy, that commandment is easy for us because He has already put His word in our mouths and hearts.