Faith is a measure of irrationality

[Jenny A]

For me with a quarter of a century of faith in the bag it's not something based on past failure. Faith it's a virtue to those that adopt it. If you're without faith presumably that's for a reason, and you're not going to see the benefits.

You have faith in your husband and that's strengthened with time. It's an intellectual assent leading to trust, just like religious faith.

No, not like religious faith. Religious faith requires belief despite lack of evidence or even in the face of relentless evidence to the contrary. Faith in a person is quite different. For one thing the person has a real past in which they did real things. Faith in a person is based on those past actions.

---

Hebrews 1;11 Now faith is confidence in what we hope for and assurance about what we do not see.

Isn't that very nearly the dictionary definition of self delusion?

No "nearly" about it. It is instructions for self delusion.