The clаims mаde in thаt оne sentence are: (a) All that up tо the present time I have accepted as mоst true and certain I have learned either from the senses or through the senses; (b) It is sometimes proved to me that these senses are deceptive; and (c) It is wiser not to trust entirely to anything by which we have once been deceived. The conclusion of the argument made in this paragraph is left unstated. It is something like: the senses should not be trusted. Two of the three statements work together to support this conclusion. Which two?