Follow justice and justice alone, so that you may live and possess the land the LORD your God is giving you. (Deuteronomy 16:20)
God emphasized the word "justice" here and wanted the Israelites to obey his laws and be just in their dealings, so that they could possess the promised land. But many of them were corrupt including priest and prophet.
Our God is a "just God". He is just in his dealings with mankind. He expects his children also to be just in their dealings.
The Apostle Paul writes,
Do everything without complaining or arguing, so that you may become blameless and pure, children of God without fault in a crooked and depraved generation, in which you shine like stars in the universe. (Philippians 2:14, 15)
Crooked and depraved generation...perfect words to describe our generation.
Yet, God expects us to be blameless and pure children. Is it possible? With the help of the Holy Spirit, Yes. By ourselves, No.
That's why Jesus said,
The Counselor, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you. (John 14:26)
But when he, the Spirit of truth, comes, he will guide you into all truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. (John 16:13)
God will definitely bring about justice for his chosen ones, who cry out to him day and night. He will not keep putting them off, because he is a "just God".