Among philosophers some have pretended that man might know every thing, — these are madmen; others that he could know nothing, — these men were not more wise: the former have given too much to man, the latter too little; both the one and the other have rushed into excess. Where then is wisdom? She consists in not believing that you know every thing — that is the attribute of God alone; in not pretending that you know nothing — that is the property of brutes: between these two extremes there is a medium which is appropriated for man — it is knowledge mixed up with darkness and tempered with ignorance.