Lock 2.1.0 IOS - Disable successful messages

How do I disable successful messages after sign up & login?
For my user case, I want to force user to verify email before he can login. So when he login I’ll check if his email is already verified or not, if not then I’ll show a message tell him to do so. Right now my message and Lock’s login successfully message are displayed at the same time which will confuse user.