Single Idea 1690

[catalogued under 10. Modality / A. Necessity / 3. Types of Necessity]

Full Idea

There are two types of necessity, one according to nature and impulse, the other by force and contrary to impulse. A stone travels upwards and downwards from different necessities.

Gist of Idea

A stone travels upwards by a forced necessity, and downwards by natural necessity

Source

Aristotle (Posterior Analytics [c.327 BCE], 94b38)

Book Reference

Aristotle: 'Posterior Analytics (2nd ed)', ed/tr. Barnes,Jonathan [OUP 1993], p.61