Pascal's Pensées

When it is said that heat is only the motions of certain molecules, and light the conatus recedendi which we feel,[150] it astonishes us. What! Is pleasure only the ballet of our spirits? We have conceived so different an idea of it! And these sensations seem so removed from those others which we say are the same as those with which we compare them! The sensation from the fire, that warmth which affects us in a manner wholly different from touch, the reception of sound and light, all this appears to us mysterious, and yet it is material like the blow of a stone. It is true that the smallness of the spirits which enter into the pores touches other nerves, but there are always some nerves touched.