Śyāmasundara: Yes. He divides it into two classes. One is there are logically necessary principles, the truths of reason as innate knowledge, just like the three sides of a triangle equal 180 degrees. That is innate knowledge, or logically necessary truth. This is also called a priori knowledge, or knowledge that exists independently. Then he says that there is knowledge acquired by experience, or a posteriori, accidental knowledge—just like snow is white, but it could be red; it's possible that it could be red—this type of truth which comes from our experience but it's accidental and it is not necessary.
Prabhupāda: So real truth is that God has got a plan, and one who knows it, that is real truth. One who hasn't got to be taught by another man but by nature, he knows it; that by nature he knows it, that is a symptom of his life, true life. And one who does not know it, that is not. That is explained in Caitanya-caritāmṛta, nitya siddha kṛṣṇa bhakta. That truth is there already, but he has forgotten it. Therefore by this propaganda of devotional service, chanting and hearing, he simply revives the truth. The truth is there, that I am eternal servant of Kṛṣṇa. Therefore the conclusion should be anyone who is cognizant of this truth that I am eternal servant, that is symptom of this truth. There is no other symptom.