What Exactly Is Faith?

After my last post here, I'd really like to know if anyone thinks they have an answer for me.

Thanks~

From Wikipedia:

Faith is in general the persuasion of the mind that a certain statement is true,[5] belief in and assent to the truth of what is declared by another, based on his or her supposed authority and truthfulness.[6] Informal usage can be quite broad, and the word is often used as a mere substitute for trust or belief.