Sentence:  ... if it come to prohibiting, there is not aught more likely to be prohibited than truth itself; whose first appearance to our eyes, <WSD>bleared</WSD> and dimmed with prejudice and custom, is more unsightly and unplausible than many errors, even as the person is of many a great man slight and contemptuous to see to. 
Meaning of the word marked with <WSD> tags:  To make blurred or dim.