No one familiar with mediaeval literature will, however, be inclined to accuse its authors of prudishness. Nevertheless, modern prudishness, as it prevails especially in England and the United States--our squeamish and shamefaced reluctance to recognize and deal frankly with the facts and problems of sex--is clearly an outgrowth of the mediaeval attitude which looked on sexual impulse as of evil origin and a sign of man's degradation. Modern psychologists have shown that prudishness is not always an indication of exceptional purity, but rather the reverse. It is often a disguise thrown over repressed sexual interest and sexual preoccupations. It appears to be decreasing among the better educated of the younger generation. The study of biology, and especially of embryology, is an easy and simple way of disintegrating the "impurity complex". "Purity" in the sense of ignorance and suppressed curiosity is a highly dangerous state of mind. And such purity in alliance with prudery and defensive hypocrisy makes any honest discussion or essential readjustment of our institutions and habits extremely difficult. One of the greatest contrasts between mediaeval thinking and the more critical thought of to-day lies in the general conception of man's relation to the cosmos. To the medieval philosopher, as to the stupidest serf of the time, the world was made for man. All the heavenly bodies revolved about man's abode as their center. All creatures were made to assist or to try man. God and the devil were preoccupied with his fate, for had not God made him in his own image for his glory, and was not the devil intent on populating his own infernal kingdom? It was easy for those who had a poetic turn of mind to think of nature's workings as symbols for man's edification. The habits of the lion or the eagle yielded moral lessons or illustrated the divine scheme of salvation. Even the written word was to be valued, not for what it seemed to say, but for hidden allegories depicting man's struggles against evil and cheering him on his way.