…from Leonardo da Vinci.
Leonardo did not attend a university to study the liberal arts, and apparently some of his contemporaries disrespected him considerably because of this omission. His response:
Because I am not a literary man some presumptuous persons will think that they may reasonably blame me by arguing that I am an unlettered man. Foolish men!…They will say that because I have no letters I cannot express well what I want to treat of…They go about puffed up and pompous, dressed and decorated with the fruits not of their own labours but those of others, and they will not allow me my own. And if they despise me, an inventor, how much more could they–who are not inventors but trumpeters and declaimers of the works of others–be blamed.
(The quote is from Jean Gimpel’s book The Medieval Machine)