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

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

The present state of atomic theory is characterized by the fact that we not only believe the existence of atoms to be proved beyond a doubt, but also we even believe that we have an intimate knowledge of the constituents of the individual atoms.

There are some things so serious you have to laugh at them.

If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.

There is no hope for any speculation that does not look absurd at first glance.

A deep truth is a truth so deep that not only is it true but it's exact opposite is also true.