...there's always some way to go...do you know the future already?
...your knowledge is a continous production of your ingenious brain...There is nothing better you can get(*)...But be cautious: this knowledge is only an approximation of something completely unknown, the 'world outside of the brain (including the brain itself)'...If you really want to know, you have always and constantly to 'probe' your approximation against the unknown. Only an 'idiot' thinks he knows already everything sufficiently clear.....
(*) This does not exclude that we are able in the future to construct interesting 'extensions' of the brain 'below the consciousness' which can extend your cognitive capabilities influencing indirectly your 'conscious knowledge'...