Charles Albert Dubray,
Catholic Encyclopedia
(1913)
“ All being, whether substance or accident, (q.v.) is either in actu or in potentiâ. The essence of creatures is a potentiality with regard to their existence. Material substances are composed of primary matter and substantial form (see Matter and Form) , matter being a pure potentiality, i.e., wholly undetermined, and form being the first determination given to matter. Efficient causality is also an application of potentiality and actuality; the cause, when at rest, remains able to act. Change is a transition from the state of potentiality to that of actuality. ”
