Full Idea
Demonstrative understanding must proceed from items which are true and primitive and immediate and more familiar and prior to and explanatory of the conclusions.
Clarification
'Premises' are statements assumed to be true at the beginning of an argument
Gist of Idea
Premises must be true, primitive and immediate, and prior to and explanatory of conclusions
Source
Aristotle (Posterior Analytics [c.327 BCE], 71b22)
Book Reference
Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.2