They will say that you are on the wrong road, if it is your own.

There is not a thought in our heads which hasn't been worn shiny by other brains.

Is there any thing whereof it may be said, See, this is new? ...

There is nothing new but what is forgotten.

There is nothing original; all is reflected light.

Originality is the act of forgetting where you read it.

What a good thing Adam had. When he said a good thing, he knew nobody had said it before.