In Obsessive Compulsive Disorder and Hypochondriasis, the person may have overvalued ideas that are difficult to distinguish from delusions; but people with these disorders generally recognize, at least to some degree, that their symptoms and thinking are irrational, even if they are dominated by them.

And all this queſtion (vvrangle e'er ſo long) / Is only this, if God has plac'd him wrong?

For truth and tenderness do more / Than coruscating metaphor.

In point of fact it was over fifteen, and even then she had bought it secondhanded, and almost unfit for use.