But it is difficult to keep these from being corrupted by reason, because as soon as they are produced we doubt whether they are right or not right. We doubt it until we have killed all the truth of our intuition. Our doubts are always the enemies of our intuition; and therefore practice is required in everyday life to keep intuition from being corrupted and finally destroyed by our doubts. We ought to build a fence round intuitions as if they were delicate plants, and protect them from being destroyed by reason and doubts. By doing so, in time we grow to be sure of our intuitions, and then we never fail to get things right.