Full Idea
Even a sufficient cause doesn't always compel its effect, since it can sometimes be interfered with so that its effect doesn't happen
Gist of Idea
Even a sufficient cause doesn't compel its effect, because interference could interrupt the process
Source
Thomas Aquinas (Quaestiones Disputatae de Malo [1271], Q6.h to 15)
Book Reference
Aquinas,Thomas: 'Selected Philosophical Writings', ed/tr. McDermott,Timothy [OUP 1993], p.182