"And yet how are we to be sure that what we observe actually is? After all, so much of what we experience as reality is the product of our remarkably flawed perception".
"(...) aquele homem acredita saber alguma coisa, sem sabê-la, enquanto eu, como não sei nada, também estou certo de não saber." (link)
"His ignorance was as remarkable as his knowledge. Of contemporary literature, philosophy and politics he appeared to know next to nothing. Upon my quoting Thomas Carlyle, he inquired in the naivest way who he might be and what he had done. My surprise reached a climax, however, when I found incidentally that he was ignorant of the Copernican Theory and of the composition of the Solar System. That any civilized human being in this nineteenth century should not be aware that the earth travelled round the sun appeared to be to me such an extraordinary fact that I could hardly realize it.
“You appear to be astonished,” he said, smiling at my expression of surprise. “Now that I do know it I shall do my best to forget it.”