All human beings desire to know, and truth is the proper object of this desire. Everyday life shows how concerned each of us is to discover for ourselves, beyond mere opinions, to know how things really are.
People cannot be genuinely indifferent to the question of whether what they know is true or not. If they discover that it is false, they reject it; but if they can establish its truth, they feel themselves rewarded.
It is this that St. Augustine teaches when he writes: "I have met many who wanted to deceive, but none who wanted to be deceived."
— John Paul II, Encyclical Fides et Ratio