Emotion, which is called a passivity of the soul, is a confused idea, whereby the mind affirms concerning its body, or any part thereof, a force for existence (existendi vis) greater or less than before, and by the presence of which the mind is determined to think of one thing rather than another.
Afektua, edo Izpirituaren Grina, deitzen da, ideia nahasi bat, haren bitartez Izpirituak bere Gorputzaren edo honen zati baten existitzeko indar bat, aitzinean zuen baino indar handiagoa edo tipiagoa, baieztatzen baitu, eta ideia hau emanez geroz, Izpiritua determinatzen du, gauza bati pentsatzera, beste bati baino areago. Azalpena