Few minds are spacious; few even have an empty place in them or can offer some vacant point. Almost all have narrow capacities and are filled by some knowledge that blocks them up. What a torture to talk to filled heads, that allow nothing from the outside to enter them! A good mind, in order to enjoy itself and allow itself to enjoy others, always keeps itself larger than its own thoughts. And in order to do this, these thoughts must be given a pliant form, must be easily folded and unfolded, so that they are capable, finally, of maintaining a natural flexibility.
―Joseph Joubert, The Notebooks of Joseph Joubert