How does King differentiate between just and unjust laws?

He says that unjust laws are laws that are not moral with the current law; whereas just laws are man made codes that square with moral laws of God.

He differentiate between just and unjust laws based on their agreement with the moral laws of God.

Explanation:

Martin Luther King Jr. in his letter "Letter from Birmingham Jail" writes about the difference between just and unjust laws. the letter was a response to the criticism he received and to defend the non-violence resistance.

He asks his audience to break the unjust laws rather than just waiting for justice to be received by the courts.

He then differentiate between the just and unjust laws stating that a just law is man-made but squares or agrees with the moral laws of God whereas unjust laws are not moral laws.