Ringo informs us:
Faith is the substance of things hoped for, things that have not happened yet.
But I believe faith refers to more than this and often describes beliefs held in the absence of complete knowledge. You have several ways to get to work, and you really don't know if your usual way is block by road construction, but you have faith that it is your best choice. So faith can apply to decisions about both beliefs to hold and to actions to take when you don't have all the knowledge you need to unequivocally force a single correct choice. I. e., you just don't know what the hell is going on.
Another interesting aspect is that many religious people speak of a certain person as being a "man or woman of faith", and consider this a complement. Hitler was a man of faith.
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Ignorance is not bliss. It is just ignorance.