[2] Let a brief statement appear here about what perception, referred to so many times, is. Everyone possesses the ability to perceive whether something is true or not. The ability he has within himself, within his mind, to draw conclusions is what enables him to perceive it; yet this ability cannot possibly exist in him without influx from the spiritual world. It is a gift that one person possesses in greater measure than another. Those who possess it in smaller measure are people who draw few conclusions within themselves or their minds and so have little perception; and if they say a thing is true they do so because others in whom they put their trust have said it is. Those however who possess the gift in greater measure are people who do not rely on others but see for themselves that it is true. But this kind of perception that everyone has involves worldly matters; nobody at the present day has any perception in spiritual ones. The reason for this is that what flows in from the spiritual source to produce that perception is blotted out and virtually annihilated by the delights of worldly and selfish love. As a consequence people have no interest in spiritual things except where duty or custom require it. Take away the fear that duty engenders, and the delight that custom affords, and people would scorn, turn away from, and indeed deny the existence of spiritual things.

[3] To have perception in spiritual things a person must have an affection for truth stirred by good and must have an unceasing desire to know truths. This leads to an enlightenment of the understanding part of his mind; and once it has been enlightened he is able within himself to see a thing with perception. But if a person is not stirred by an affection for truth, then he knows what he knows to be true from the teaching of the Church on which he pins his faith, something he also knows because priest, presbyter, or monk has declared it to be. From all this one may see what perception is and that it exists in worldly matters but not in spiritual ones. This is further evident from the consideration that everyone adheres to the system of religious belief into which he was born; this includes those who were born Jews and those outside the Church, even though they live in places where the Church is situated. The same goes for the adherents to any heresy. If utter truths were stated and also proved to them they would still be totally incapable of perceiving that they were truths; they would be seen by them as falsities.