If everyone is thinking alike, then somebody isn't thinking.

I love quotations and you can find a huge selection on my website. You can also subscribe to receive one at random each a week or day if you wish.

Many of them have a connection in some way. Here are two of my favourites, separated by over 400 years.

There is no conversation more boring than the one where everybody agrees.

Credit: Michel de Montaigne

If everyone is thinking alike, then somebody isn't thinking.

Credit: George S. Patton

There is psychological phenomenon called groupthink that makes "thinking alike" more likely in a group discussion.