Aristotle - The Organon - index for ANALYTICA PRIORIA Book 1 Part 8

Necessity, actuality and possibility

Paragraph 1 Since there is a difference according as something belongs, necessarily belongs, or may belong to something else (for many things belong indeed, but not necessarily, others neither necessarily nor indeed at all, but it is possible for them to belong), it is clear that there will be different syllogisms to prove each of these relations, and syllogisms with differently related terms, one syllogism concluding from what is necessary, another from what is, a third from what is possible.
Paragraph 2 There is hardly any difference between syllogisms from necessary premisses and syllogisms from premisses which merely assert.

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