It is to be believed that the nature of the human mind has been so fashioned in accordance with an order established by the Creator that it is directed toward things of the mind and sees them as if in a certain spiritual light of its own kind just as the eye of the body sees that which is displayed before it in a physical light appropriate to it and to which it conforms itself.
De Trinitate XII, 15, 24.
The nature of the soul is superior to that of the body; it transcends the body in many ways. It is spiritual, incorporeal, and close to the substance of God. It is something invisible; it rules the body; moves the body’s members; directs the senses; produces thoughts; realizes actions; conceives in itself images of infinite realities. In brief, who is equal to praising the soul.
Enarrationes in psalmos 145, 4.
Thus, a man grows up and comes to the age of reason and begins to feel the power of nature’s law which every man bears stamped in his heart: ‘Do unto others as you would have them do unto you’. Does one learn this in books or, rather, doesn’t one read this in nature itself? Does anyone want to be robbed of what is his? Of course not. Here it is then, the law written in the heart; ‘don’t do unto other what you don’t want done to yourself’. Yet, many men violate this law.
In Ioannis Evangelium Tractatus XLIX, 12.
What does it mean ‘to understand’ except to live in a brighter and more perfect way the light of the mind itself.
De libero arbitrio I, 7, 16.
Love overwhelms us as we look for the truth.
De Trinitate I, 5, 8.
I ask everyone if they relish truth more than error and, without second thoughts, everyone responds that truth is more to be desired. They respond with the same certainty as they would say that they want to be happy because the happy life is the enjoyment of truth.
Confessiones X, 23, 33.