Read the excerpt from The Strange Case of Dr. Jekyll and Mr. Hyde.

But time began at last to obliterate the freshness of my alarm; the praises of conscience began to grow into a thing of course; I began to be tortured with throes and longings, as of Hyde struggling after freedom; and at last, in an hour of moral weakness, I once again compounded and swallowed the transforming draught.

The excerpt confirms the prediction that

Jekyll will become violent without becoming Hyde.
Hyde will gain some of Jekyll’s intelligence.
Hyde will not be able to overcome Jekyll’s vulnerabilities.
Jekyll will not be able to permanently resist becoming Hyde.