The meaning of Monotheism and Justice

The Messenger of Allah, Allah’s blessings be upon him and his Family, said: The appearance of Monotheism is in its interior, and its interior is in its appearance; its appearance is characterized and cannot be seen, and…

a man asked him, to which he said: Indeed, the foundation of the religion is Monotheism and Justice, and its knowledge is abundant, and a rational person must have it. So, mention what can be easily stood upon and is…