Final answer:
In his soliloquy, the king admits his guilt and takes responsibility for the murder. His mental and moral condition is shown to be burdened by guilt and remorse.
Step-by-step explanation:
In Shakespeare's play, the king reveals his guilt and takes responsibility for the murder in his soliloquy. He acknowledges that he is the one who is guilty and there is no one else to blame.
In terms of the king's mental and moral condition, his soliloquy shows that he is burdened by immense guilt. He feels remorse for his actions and is haunted by the consequences of his crime.