Deuteronomy 28:14

and thou shalt not go aside from any of the words which I command thee this day, to the right hand or to the left, the slightest deviation from the path of God's commands being regarded as unfaithfulness to the covenant between them and Jehovah, to go after other gods to serve them. There is always that suggestive and impressive reminder of the necessity of keeping the covenant with all strictness, in that perfection which the holiness of God demands. This applies also today. Where the fear of God dwells in a country, the blessing of the Lord is usually in evidence, for righteousness exalteth a nation.