“Truth must be found in reality, not systems.”
Source: What Is Art?: Conversations with Joseph Beuys
                                    Joseph Beuys  was a German Fluxus, happening, and performance artist as well as a painter, sculptor, medallist, installation artist, graphic artist, art theorist, and pedagogue.
His extensive work is grounded in concepts of humanism, social philosophy and anthroposophy; it culminates in his "extended definition of art" and the idea of social sculpture as a gesamtkunstwerk, for which he claimed a creative, participatory role in shaping society and politics. His career was characterized by open public debates on a very wide range of subjects including political, environmental, social and long term cultural trends. He is widely regarded as one of the most influential artists of the second half of the 20th century.
                                    
                                         
                                        
                                        Wikipedia
                                        
                                        
                                         
                                    
                                
“Truth must be found in reality, not systems.”
Source: What Is Art?: Conversations with Joseph Beuys
1970's, I Am Searching For Field Character,' 1973/74
1970's, I Am Searching For Field Character,' 1973/74
Source: 1980's, Interview with Kate Horsefield, 1980, pp. 62-63; Also cited in: Video Data Bank, School/Art Institute Chicago, (1981) Profile, Volume 1
                                        
                                        as quoted in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, by Victoria Walters, LIT Verlag Münster, 2012, p. 206 
Quotes after 1984, posthumous published
                                    
                                        
                                        Quote from 'A. Beuys in the wilderness', 1974 (lecture at the Ulster Museum); as cited in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, Victoria Walters, LIT Verlag Münster, 2012, p. 198 
1970's
                                    
“Art is the only power to free humankind from all repression.”
Source: 1970's, Joseph Beuys... Public Dialogue' 1974, p. 5
                                        
                                        Beuys' quote from Theory of Social Sculpture, 1979, as cited in: Chris Thompson. Felt: Fluxus, Joseph Beuys, and the Dalai Lama. 2011. p. 88-89 
1970's
                                    
                                        
                                        Quote of Joseph Beuys and Heinrich Böll (1972), as cited in Joseph Beuys, exh. cat., Caroline Tisdall, Solomon R. Guggenheim Museum, New York 1979. p. 278 
1970's
                                    
Source: 1970's, Joseph Beuys... Public Dialogue' 1974, p. 5; Lead paragraph of article
                                        
                                        Quote of Beuys, in Studio International Vol. 195, (1981), p. 46 
1980's
                                    
                                        
                                        Quoted in: Robert C. Morgan (1978). The Role of Documentation in Conceptual Art: : An Aesthetic Inquiry. p. 176. 
1970's, I Am Searching For Field Character,' 1973/74
                                    
Source: 1980's, Interview with Louwrien Wijers, 1981, p. 189 - in 'Joseph Beuys and the Dalai Lama'
                                        
                                        1980's 
Source: Times Thermic Machine, 1982
                                    
                                        
                                        Quote in an interview with , 1986; republished in: Joseph Beuys, Carin Kuoni. Joseph Beuys in America: Energy Plan for the Western Man. New York, 1993.pp. 169-170
Beuys refers in his quote to the so-called 'Silence of Marcel Duchamp', the period that Duchamp stopped creating art 
1980's
                                    
Source: 1970's, Joseph Beuys... Public Dialogue' 1974, p. 5
                                        
                                        Quote of Beuys in an interview with Alan Moore and Edit deAk, 1974; as cited in: Joseph Beuys in America: Energy Plan for the Western Man., Carin Kuoni; New York, 1993, p. 213 
1970's
                                    
                                        
                                        Quote from 'I put me on this train', interview with Art Papier, 1979; as cited in: Joseph Beuys in America: Energy Plan for the Western Man, Carin Kuoni; New York, 1993, p. 44 
1970's
                                    
                                        
                                        Beuys, 1997, p. 11, xix); as quoted in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, by Victoria Walters, LIT Verlag Münster, 2012, p. 192 
Quotes after 1984, posthumous published
                                    
1970's, I Am Searching For Field Character,' 1973/74
1970's, Every Man an Artist: Talks at Documenta 5', 1972
                                        
                                        Götz Adriani, Joseph Beuys, Winfried Konnertz (1979) Joseph Beuys, life and works. p. 255 
1970's
                                    
                                        
                                        Quote by Furlang, 1974, p. 7; as quoted in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, Victoria Walters, LIT Verlag Münster, 2012, p. 206 
1970's
                                    
1970's, Every Man an Artist: Talks at Documenta 5', 1972
1970's, Every Man an Artist: Talks at Documenta 5', 1972
1970's, Every Man an Artist: Talks at Documenta 5', 1972
Source: 1980's, Interview with Kate Horsefield, 1980, p. 62; also quoted in: Video Data Bank, School/Art Institute Chicago, (1981) Profile, Volume 1
                                        
                                        Quote of Caroline Tisdall, 1979, p. 210; as cited in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, Victoria Walters, LIT Verlag Münster, 2012, p. 180 
1970's
                                    
1970's, Every Man an Artist: Talks at Documenta 5', 1972
                                        
                                        Quoted by Germano Celant, Beuys, tracce in Italia, Amelio, 1978 
1970's
                                    
                                        
                                        Quote of Donald Kuspit, The Cult of the Avant-garde Artist, New York: Cambridge University Press, 1993, p. 95 
Quotes after 1984, posthumous published
                                    
                                        
                                        Quote of Joseph Beuys (1982), as cited in: Land and environmental art, Jeffrey Kastner, Brian Wallis (1998), p. 164 - about his 7.000 Oaks [see there the image]. 
1980's
                                    
                                        
                                        Beuys laughed, and so did everyone else of the public 
In a public debate at the Kunstring (Artcircle) Folkwang in Essen, 1972; (Stachelhaus 1991, p. 71); as quoted in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, Victoria Walters, LIT Verlag Münster, 2012, p. 29 
1970's
                                    
                                        
                                        Quote of Donald Kuspit, The Cult of the Avant-garde Artist, New York: Cambridge University Press, 1993, p. 93 
Quotes after 1984, posthumous published
                                    
Source: 1970's, Interview with Louwrien Wijers, 1979, p. 243; Also cited in: Louwrien Wijers (1996). Writing as Sculpture: 1978 - 1987. p. 38
                                        
                                        Joseph Beuys (1982), cited in: Claudia Mesch (2013) Art and Politics: A Small History of Art for Social Change Since 1945. p. 160 
1980's
                                    
1970's, Every Man an Artist: Talks at Documenta 5', 1972
                                        
                                        Quoted in: Joseph Beuys, Carin Kuoni. Joseph Beuys in America: Energy Plan for the Western Man. New York, 1993, p. 128; Comment on his first Fluxus performance in 1963 'Heal like with like'. 
1970's, Interviews with Caroline Tisdall, 1974 & 1978
                                    
                                        
                                        Quote in a conversation between Lama Sogyal Rinpoché and Joseph Beuys, 1982; republished in: Joseph Beuys, Carin Kuoni. Joseph Beuys in America: Energy Plan for the Western Man. New York, 1993. p. 197 
1980's
                                    
1970's, Every Man an Artist: Talks at Documenta 5', 1972
Source: 1980's, Interview with Louwrien Wijers, 1981, p. 185 - Beuys' statement on planting seven thousand oaks in Kassel, in 'Joseph Beuys and the Dalai Lama'
“Even the act of peeling a potato can be an artistic act if it is consciously done.”
                                        
                                        Three quotes of Joseph Beuys, in 'An interview with Joseph Beuys,', Willoughby Sharp, published in 'Artforum,' November 1969; as quoted in Six Years: The Dematerialization of the Art Object from 1966 to 1972, Lucy R. Lippard, University of California Press, 1973, p. 121 
1960's
                                    
1970's, Every Man an Artist: Talks at Documenta 5', 1972
                                        
                                        As cited in: Joseph Beuys, Dia Art Foundation. Joseph Beuys, Dia Art Foundation, 1988. p. 23 ; Statement about the ' Rubberized Box http://rubberizedbox.blogspot.nl/2007/10/rubberized-box-by-joseph-beuys-1957.html' by Joseph Beuys, 1957 
1970's, Interviews with Caroline Tisdall, 1974 & 1978
                                    
                                        
                                        Quote in interview with Willoughby Sharp, 1969; as quoted in Joseph Beuys and the Celtic Wor(l)d: A Language of Healing, Victoria Walters, LIT Verlag Münster, 2012, p. 212,  note vii 
1960's
                                    
                                        
                                        Quote of Joseph Beuys,  from The felt hat: Joseph Beuys, a life told, Lucrezia De Domizio Durini, p. 201 
1980's
                                    
Source: 1970's, Interview with Louwrien Wijers, 1979, p. 249; Also cited in: Louwrien Wijers (1996). Writing as Sculpture: 1978 - 1987. p. 40
1960's
Source: 1970's, I Am Searching For Field Character,' 1973/74, p. 48