“But you can't be too careful of these strange new ideas and new things. You must not tamper with them. If you try to understand them, they may entangle and get hold of you, and then where will you be? Hide your mind from them, and hide them from your mind. Stick to the plain common sense of life. There will always be a tomorrow rather like today. At least so far there always has been a fairly similar tomorrow. Once or twice lately there have been jolts... Try not to notice these jolts. 'It is no good meeting trouble halfway.”