The logic now in use serves rather to fix and give stability to the errors which have their foundation in commonly received notions than to help the search for truth. So it does more harm than good.
There is a difference between happiness and wisdom: he that thinks himself the happiest man is really so; but he that thinks himself the wisest is generally the greatest fool.
It would be unsound fancy and self-contradictory to expect that things which have never yet been done can be done except by means which have never yet been tried.