Full Idea
The ordinary conditional loses its point when the truth value of its antecedent is known.
Gist of Idea
Conditionals are pointless if the truth value of the antecedent is known
Source
Willard Quine (Word and Object [1960], §46)
Book Reference
Quine,Willard: 'Word and Object' [MIT 1969], p.221
A Reaction
A beautifully simple point that reveals a lot about what conditionals are.