Prediction is very difficult, especially if it's about the future.

You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.

The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.

You must come to Copenhagen to work with us. We like people who can actually perform thought experiments!

In our description of nature the purpose is not to disclose the real essence of the phenomena but only to track down, so far as it is possible, relations between the manifold aspects of our experience.

It is the hallmark of any deep truth that its negation is also a deep truth.

If you aren't confused by quantum mechanics, you haven't really understood it.