- "In theory, there is no difference between theory and practice. But, in practice, there is."
- Johannes Lambertus Adriana van de Snepscheut (Computer scientest. 1953–1994) Attributed by Doug Rosenberg and Matt Stephens in Use Case Driven Object Modeling with UML Theory and Practice (2007).
- "The superfluous, a very necessary thing."
- Voltaire (Psuedonym of Francois Marie Arouet. Writer and embodiment of C18 Enlightenment. 1694-1778)
- "Si Dieu n'existait pas, il fautrait l'inventer."
(If God did not exist, it would be necessary to invent him.)
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