Full Idea
To affirm a compound of the form 'p and not-p' is just to have mislearned one or both of these particles.
Clarification
The 'particles' are "and" and "not"
Gist of Idea
To affirm 'p and not-p' is to have mislearned 'and' or 'not'
Source
Willard Quine (From Stimulus to Science [1995], p.23), quoted by Robert Fogelin - Walking the Tightrope of Reason Ch.1
Book Reference
Fogelin,Robert: 'Walking the Tightrope of Reason' [OUP 2004], p.32
A Reaction
Quoted by Fogelin. This summarises the view of logic developed by the young Wittgenstein, that logical terms are 'operators', rather than referring terms. Of course the speaker may have a compartmentalised mind, or not understand 'p' properly.