Proust writes, he remembers, physically. He depends on his body to give him the information that will bring him to the past. His book is called 'In Search of Lost Time,' and he does it through the senses. He does it through smell. He does it through feeling. He does it through texture. It is all physically driven, that language.
As exercise is necessary to the development of physical muscle, so development of the moral nature is accomplished through temptation. The soul being given choice, may exercise it in whatever direction it chooses, for it learns just as well by its mistakes as by right action in the first place, perhaps even better.