If we acknowledge our sins, he is faithful and just and will forgive our sins and cleanse us from every wrongdoing.
John 1:9

Because God cannot lie and is faithful, once He gives a promise He cannot break it. God is always true and never a liar.

God’s commandments, by definition are given to man, not Himself. This is why God can take vengeance and man cannot not. It is like saying green 7s and blue 9s. They are categories that do not belong together. Although God’s commands do not apply to Him, His perfect, faithful nature always applies, thus, if He gives a promise He will be faithful to do it.

To be righteous is acting and thinking that values God above all things. For man this comes in two main ways. One is to agree with all God has said is true, and reject human speculation. The second is to obey Him. We must make a quick note that many commands are in the form of precious and marvelous promise of good. It is not a suggestion to ask God to forgive you of all our sins and be reconciled or blessed or healed (etc.). Lastly, value is not a third way because to value the things God values is included in your intellectual agreement with Him and obeying Him.  When we believe His revelation and obey Him we are acting and thinking in a way that values Him above all others.

God being righteous is not about obeying, because God is free and not under an authority. God is knowledge, He does not receive knowledge and then must agree with it, as man does. God being faithful to His perfect nature and perfect understanding and God valuing Himself above all others as the greatest is good, because God is so. We can label this as God being righteous when He acts this way, which is always. Jesus says He is righteous because He does not His will, but the Father’s (John 5:30). Jesus values His Father’ will above all others. For God to seek His own desires and will is righteous. For us, it is to seek His will above all others.  

In relation to man, God is “just and righteous” to fulfill His promise. Before the promises, God is free to show mercy to whom He wants. No one forces Him to be kind and gracious. Because God is truth and is perfect, once He gives a promise, He would be unjust and unrighteous not to do it. He would be acting in a way that does not value His perfect nature and knowledge above all others.

This is why John says God is just or righteous to forgive our sins. He promised and Jesus finished the requirements. On the demand of faith God is righteous to forgive us.  We should be forgiven in order for God to value His own worth. It is necessary for us to be forgiven on the demand of faith.

The same with the promise of Abraham and the Contract by Jesus’ blood. See Vincent Cheung, “The Edge of Glory,” and “Our Contract” for more details of the promised blessings about this. These promises, already secured by Jesus includes things like healing, prosperity, miracles for all sorts of things, wisdom and blessings. On the demand of faith God is righteous to give us all such things when we ask. He would be unrighteous to His own value, if He did not. This is why, Jesus said it was necessary for a daughter of Abraham to be healed on the sabbath. She ought to be healed because she is a daughter of Abraham.

Thus, we ought to be forgiven, we ought to be healed, we ought to be wealthy, we ought to have fruitful relationships and ministries.  It is necessary for us to be healed on the demand of faith. It is necessary for us to be given miracles on the demand of faith. Anything less is to think and act in a way that would devalue Him as the greatest above all others.