That which cannot be said must not be said. That which cannot be said, one must be silent thereof.

Belief in the causal nexus is superstition.

It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.

Words are probes. Some reach very deep, some only to a little depth.

Nothing is so difficult as not deceiving oneself.

Everything that can be thought at all can be thought clearly. Everything that can be said can be said clearly. Ludwig Wittgenstein

Think of words as instruments characterized by their use, and then think of the use of a hammer, the use of a chisel, the use of a square, of a glue pot, and of the glue.