8:31 If you continue in my word These disciples have agreed in principle with Jesus’ teaching, but their perseverance in following His teaching will reveal whether they are genuine disciples.
8:32 the truth Likely invokes the ot concept of truth, referring to a dependable foundation for building a way of life (see note on Psa 26:3). Knowing the truth about Jesus is a sign of spiritual freedom from the bondage of sin. (See John 8:34)
My experience says that there are many who will not consider that they don't already know the truth. I've seen irrational anger toward anyone who suggests that. Peer pressure is a dangerous thing.
Yes, this is as Jesus said, Matthew 13:13 , it is only the people of Yahweh that are given the mysteries of the kingdom. Those who have not received the mysteries must make up their own, hence the false churches.