Is it right to probe so deeply into Nature’s secrets? The question must here be raised whether it will benefit mankind, or whether the knowledge will be harmful.

Meaning of the quote

The quote is asking whether it's a good idea to try to learn too much about the hidden parts of the natural world. It wonders if this new knowledge will help people or if it could actually be bad for them. The scientist wants us to think carefully about whether we should keep studying these secrets, or if it might be better to leave some things unknown.