the lecture halls seemed filled with the spirit of the great and the wise, and i thought the professors were the embodiment of wisdom.If I have since learned differently, I am not going to tell anybody.

 

Explain the above lines (esp.the second sentence) briefly from chapter 20 of Story of my life

Helen Keller began her studies with utmost eagerness when she entered Radcliffe College, and it seemed as if she had the capacity to learn almost all. The lecture hall, she felt, was filled with greatness, and she thought the professors who were facilitating her were the representatives of wisdom. She says this as she was amazed to experience the amount knowledge the professors had