E5A1
Axiom — Part V
Latin
Si in eodem subjecto duæ contrariæ actiones excitentur, debebit necessario vel in utraque vel in una sola mutatio fieri donec desinant contrariæ esse.
English (Elwes 1883)
If two contrary actions be started in the same subject, a change must necessarily take place, either in both, or in one of the two, and continue until they cease to be contrary.
Modern English
If two contrary actions are aroused in the same subject, a change must necessarily occur in one or both of them until they cease to be contrary.