"Evil can never truly hide itself" is the theme covered in this excerpt. This is because it shows that even if Hyde hid and did evil without anyone being able to solve it and even if that evil was in relation to himself, it would not be hidden and it would not be possible that this truth would never be discovered, because all the evil is perceptible at one time or another.
Paraphrase is defined as the restatement of a passage or text with the use of other words. It is used to explain the meaning of the passage or text in a more understandable and clearer way. A paraphrase does not use quotation marks. Instead, it is commonly presented with declaratory phrases.