Give your reason, and shut up!

There is usually an excellent reason for something: for doing it, for not doing it. Often we tell the other party this reason. We then think of another idea, and we give that as well. Then a third reason occurs to us, and we add that in for good measure.

The problem is that each reason is weaker than the one that went before. Gradually, the original, compelling argument is diluted.

You could use this tendency to your advantage. When faced with a strong argument, ask the other party if there are any other reasons. They will not be able to resist the temptation to give two or three weaker than the last. Eventually, the arguments can become so feeble as to be self-defeating.

If you have a reason for doing something, give it and shut up!