There is the science of physiognomy or phrenology, which goes so far as saying that what one acquires helps to form the different muscles of the features and head, according to what one has taken into one's mind. And it is written in the Koran that every part of one's being will bear witness to one's action. I should say that it does not need to bear witness in the hereafter, it bears it every hour of the day. If one examines life, one will find that the mind and body are formed from what one takes from the outer world.