Gregory of Nyssa
Catena Aurea · Lukasevangelium 10
And, behold, a certain Lawyer stood up, and tempted him, saying, Master, what shall I do to inherit eternal life? He said unto him, What is written in the law? how readest thou? And he answering said, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind; and thy neighbour as thyself. And he said unto him, Thou hast answered right: this do, and thou shalt live.
(de Hom. Opif. c. 8.) the soul is divided into three faculties; one merely of growth and vegetation, such as is found in plants; another which relates to the senses, which is preserved in the nature of irrational animals; but the perfect faculty of the soul is that of reason, which is seen in human nature. By saying then the heart, He signified the bodily substance, that is, the vegetative; by the soul the middle, or the sensitive; but by saying the mind, the higher nature, that is, the intellectual or reflective faculty.