A sage is not afraid of lack of knowledge: he is not afraid of hesitations, or hard work, but he is afraid of only one thing — to pretend to know the things which he does not know. You should study more to understand that you know little. (Michel de Montaigne, October 1)
The difference between real material poison and intellectual poison is that most material poison is disgusting to the taste, but intellectual poison, which takes the form of cheap newspapers or bad books, can unfortunately sometimes be attractive. (January 1)