“On the whole, you could say that if you are defending your opinions, you are not serious. Likewise, if you are trying to avoid something unpleasant inside of yourself, that is also not being serious. A great deal of our whole life is not serious. And society teaches you that. It teaches you not to be very serious – that there are all sorts of incoherent things, and there is nothing that can be done about it, and that you will only stir yourself up uselessly by being serious. But in a dialogue you have to be serious. It is not a dialogue if you are not – not in the way I’m using the word.”
― David Bohm, On Dialogue

David Joseph Bohm (December 20, 1917 – October 27, 1992) was an American-Brazilian-British scientist who has been described as one of the most significant theoretical physicists of the 20th century and who contributed unorthodox ideas to quantum theory, neuropsychology and the philosophy of mind. Wikipedia