Philosophy

"And now here is my secret, a very simple secret. It is only with the heart that one can see rightly; what is essential is invisible to the eye." -- Antoine de Saint-Exupéry, The Little Prince (1943)

"The great basic question of all philosophy, especially of more recent philosophy, is that concerning the relation of thinking and being. ... The answers which the philosophers gave to this question split them into two great camps. Those who asserted the primacy of spirit to nature and, therefore, in the last instance, assumed world creation in some form or other — and among the philosophers, Hegel, for example, this creation often becomes still more intricate and impossible than in Christianity — comprised the camp of idealism. The others, who regarded nature as primary, belong to the various schools of materialism." -- Friedrich Engels, Ludwig Feuerbach & the End of Classical German Philosophy (1886)