Wittgenstein once wrote:
For that would appear to presuppose that we were excluding certain possibilities, and this cannot be the case, since it would require that logic should go beyond the limits of the world; for only in that way could it view those limits from the other side as well.
We cannot think what we cannot think; so what we cannot think we cannot say either.
And later he concludes his tractatus with the words
6.54 My propositions serve as elucidations in the following way: anyone who understands me eventually recognizes them as nonsensical, when he has used them—as steps—to climb up beyond them. (He must, so to speak, throw away the ladder after he has climbed up it.)
He must transcend these propositions, and then he will see the world aright.
7 What we cannot speak about we must pass over in silence.
And Bertrand Russell summarises in his Introduction that
What we cannot think we cannot think, therefore we also cannot say what we cannot think.
This may leave us in a state of paralysis when it comes to the need of change; but it may also lead us to use the mistakes we make as some form of beauty: as challenge and opportunity to work on unknown paths – not simply as path we did not know before but going beyond this, at path we did not even imagine that they would exist. Paradoxically it means to start from what is really given, unveiled from abstract thoughts and political-economic frameworks, starting from real reality as fundamental truth, and develop things from there.
Talking about economics, as we did end of September in Athens on occasion of the annual Euromemo-conference, we may see this as special challenge to move further with what is today called heterodox economics. Some reflections, trying to radicalise approaches, made at the end of the conference can be found here.
 Wittgenstein, Ludwig, 1921: Tractatus Logico-Philosophicus; Translated by D. F. Pears and B. F. McGuinness With an introduction by Bertrand Russell; London/New York: Routledge, 1974: 68
 ibid.: 89
 Russell, Bertrand, 1922: Introduction; in: Ludwig Wittgenstein, 1921: Tractatus Logico-Philosophicus; Translated by D. F. Pears and B. F. McGuinness With an introduction by Bertrand Russell; London/New York: Routledge, 1974: XX