Exclude from serious consideration proposals that we cannot criticize

"What ought to disturb us are not mistakes in general, but only those of them that we are powerless to correct. Indeed, we are plainly entitled to exclude from serious consideration proposals that we cannot criticize and therefore cannot put right. For once we embark on the venture of investigating the world and our involvement in it, we cannot shrink from scrutinizing every move we make and abandoning those that turn out to be mistaken. And if this is to work, we must from the start disallow ideas that cannot, if mistaken, be corrected. We can be indulgent towards the occurrence of errors; indeed, we must be, for whatever we do we shall not dodge them all. But incorrigible, irrevocable, or uncontrollable errors we cannot afford to commit. It is the perpetuation of errors that interferes with our understanding; and it is this, rather than their perpetration, that we must exert ourselves determinedly to avert."