The sublime being the “echo of a great soul” (36), in Dr Jekyll case it is his evil soul. When he is Hyde, he is not conscious of Jekyll anymore; he is in another altered state of mind that is associated with the sublime feelings of obscurity and power
Jekyll's Sublime. The sublime is a place where the mind is not only a captive to the sensation, but also free because the mind is exploring emotions and unlocking consciousness that is usually locked up. ... The complexity of the sublime in itself is an altered state because the mind is not in its original state.