There are things that are so serious that you can only joke about them.

Niels Bohr (1885-1962) Danish physicist

(Attributed)

Sometimes misattributed to Werner Heisenberg. Quoted in A Pais, The Genius of Science: A Portrait Gallery (2000). Other sources give Pais' translation as ""Some subjects are so serious that one can only joke about them."

Alt trans.: "Some things are so serious that one can only joke about them."