The Hour of the Furnaces (1968)

Here's a quote from Fernando Solanas & Octavio Getino's "Towards a Third Cinema"

"The existence of a revolutionary cinema is inconceivable without the constant and methodical exercise of practice, search, and experimentation. It even means committing the new film-maker to take chances on the unknown, to leap into space at times, exposing himself to failure as does the guerrilla who travels along paths that he himself opens up with machete blows. The possibility of discovering and inventing film forms and structures that serve a more profound vision of our reality resides in the ability to place oneself on the outside limits of the familiar, to make one's way amid constant dangers.
Our times is one of hypothesis rather than of thesis, a time of works in progress--unfinished, unordered, violent works made with the camera in one hand and a rock in the other. Such works cannot be assessed according to the traditional theoretical and critical canons. The ideas for our film theory and criticism will come to life through inhibition-removing practice and experimentation. 'Knowledge begins with practice. After acquiring theoretical knowledge through practice, it is necessary to return to practice.' (12)"

And then there's this...