Is this a thesis or common knowlege?

Does it need to be one or the other or both or neither. In the tradition of Rene' Descartes, all propositions may be tested. Was his doubt contradicting self evident common knowledge or was it a thesis statement. Need a thesis be uncontradictable to become record logic? If that were true, we may not have records of anything. Would Bishop Berkley be on record for proposing 'nothing' and 'matter' are synonyms.