It is remarkable how, through the addition of thought which the animal lacks, so lofty and vast a structure of human happiness and unhappiness is raised on the same narrow basis of joys and sorrows which the animal also has. With reference to this, his feelings are exposed to such violent emotions, passions, and shocks, that their stamp can be read in the permanent lines on his face; and yet in the end and in reality, it is only a question of the same things which even the animal obtains, and indeed with incomparably less expenditure of emotion and distress.

Arthur Schopenhauer, Parerga and Paralipomena (1851)