Since every movement is a change, and the kinds of change are the three named above, and of these those in the way of generation and destruction are not movements, and these are the changes from a thing to its contradictory, it follows that only the change from positive into positive is movement.
1068a) Baina mugimendu oro aldaketaren bat denez, eta aipaturiko hiru aldaketa-mota horietatik genesiaren eta ustelduraren araberakoak-kontraesanaren bidez ematen direnak, alegia-mugimendu ez direnez, subjektutik subjektura ematen dena izango da, nahitaez, 5) mugimendu bakarra.