"And what good has all your reading done you? Out of all the things you have read, how much has really stayed in your soul, what roots have grown there that will, in a good time, bring forth fruit? Examine your heart carefully. If you compare the whole of what you know with what you don’t know, you will find that your knowledge is like a small stream dried up in the summer heat compared to the ocean of your ignorance. And even granted that you do know a lot, what difference does it make?"
— Augustinus in Petrarca’s Secretum, Second Dialogue