Nowadays, anyone who wishes to combat lies and ignorance and to write the truth must overcome at least five difficulties. She must have the courage to write the truth when truth is everywhere opposed; the keenness to recognize it, although it is everywhere concealed; the skill to manipulate it as a weapon; the judgment to select those in whose hands it will be effective; and the ability to spread the truth among the people.

Bertolt Brecht, from Galileo.