The better he who, when faced with what he does not know, keeps quiet instead of doubting. And if he does not feel confident in his perception, and if he is really interested in the object of his current ignorance, let him study, listen and, above all, want to know. And let him stay that way for as long as it takes, studying, listening and wanting. One day, perhaps, he will know; and he will value the knowledge he has acquired. If, however, he does not get to know, at least he will have maintained a posture that he can never be ashamed of.