Full Idea
A demonstration is superior if it depends on fewer suppositions or propositions - for if these are familiar, knowledge will come more quickly, and this is preferable.
Gist of Idea
Demonstration is better with fewer presuppositions, and it is quicker if these are familiar
Source
Aristotle (Posterior Analytics [c.327 BCE], 86a35)
Book Reference
Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.39