We will also make use of the following simple observation.

Sometimes the flashes come from an odd word or a simple observation.

The evidence of simple observation is not, however, perfectly convincing.

Now he knew better than to bother making even simple observations.

The second law is offered as a simple observation in the same essay.

But this is not a book in which even her simplest observations can be taken at face value.

On this last point let me for the present be content with a simple observation.

What little of his attention was left over was involved in simple observation.

Perhaps the key to the whole thing is that these simple observations are true, but we've never really stopped to think about them.

The reason to distinguish this point lies in the following simple observation.