Please tell me what "how true" exactly means in the context below. Does he say, by using the expression "how true", that he completely agrees with what the preacher said?
I like what a preacher said about this. He said, “You never fail one of God’s tests. You just keep taking them until you pass.” How true!
I like these wise words. Yes, he says 'how true (this is)' to show his complete agreement with the preacher.