After all the Bible is full of the evidence that many who thought themselves saved deluded themselves and that many others who at one time walked with God later gave up doing so. The other disciples were surprised by Judas and Paul was surprised by Demas. That is the question. And that is the question we will take up in some detail the next two Lord's Day evenings. But, let's be clear in our minds.
Assurance is a part of the Bible's teaching of the Christian life.
We ought to have it, the Bible is intent that we should have it. We need it and more and more of it. We have a solid foundation for it, many such foundations indeed.