The Philosophy of the Teachings of Islam — Page 9
9 deeply affect the soul. For instance, when our eyes are filled with tears, even if the tears are artificially induced, the heart is immediately affected and becomes sorrowful. In the same way, when we begin to laugh, even if the laughter is artificially induced, the heart begins to feel cheerful. It has also been observed that physical prostration in prayer induces humility in the soul. As a contrast when we draw ourselves up physically and strut about with our neck raised and our breast pushed forward, this attitude induces a mood of arrogance and vain glory. These instances establish clearly that physical conditions certainly affect spiritual conditions. Experience also shows that different types of food affect the intellect and the mind in different ways. For instance, careful observation would disclose that people who refrain altogether from eating meat gradually suffer a decline of the faculty of bravery; they lose courage and thus suffer the loss of a divinely bestowed praiseworthy faculty. This is reinforced by the evidence of the divine law of nature that the herbivorous animals do not possess the same degree of courage as do carnivorous ones. The same applies to birds. Thus there is no doubt that morals are affected by food. Conversely those who are given to a diet consisting mainly of meat and eat very little of greens