I know a lot before a start an action. I know a lot about the necessity of the general idea of sculpture, but I dont know anything about the process in which the action will run. When the actions runs, my preparation works, because I am prepared to do a thing without knowing where it goes. You see, it would be a very uninteresting thing it would have nothing to do with art if it were not a new experiment for which I have no clear concept. If I had a clear concept of solving the problem, I would then speak about the concept and it wouldnt be necessary to make an action. Every action, every artwork for me, every physical scene, drawings on the blackboard, performance, brings a new element in the whole, an unknown area, an unknown world.

Joseph Beuys
Another Quote

The Power Of Failure: We Get To Decide What It Means