There is much to be said concerning the nature of faith. But I think it important to establish how one comes to have faith in the first place before proceeding.
Paul says in Hebrews 11:1: "1 Now faith is the substance of things hoped for, the evidence of things not seen."
Paul also says in Romans 10:17: "So then faith cometh by hearing, and hearing by the word of God."
The suggestion has been asserted that faith is blind because it is believed by some that Hebrews says that it is. I disagree that that is what Paul meant. In support of my position I refer to that same Paul speaking in Romans which says that faith is the result of hearing the word of God. (now we can hear the word of God, but we can also read it) The point is that hearing or reading the word of God; which are the testimonies of God's authorized servants, is the evidence on which faith comes, or on which it is based. A person does not exercise faith in something without first having some idea concerning what that something is.
In the Book of Mormon, the Book of Alma 32:26,27: it says: "Now, as I said concerning faith—that it was not a perfect knowledge—even so it is with my words. Ye cannot know of their surety at first, unto perfection, any more than faith is a perfect knowledge." --- "But behold, if ye will awake and arouse your faculties, even to an experiment upon my words, and exercise a particle of faith, yea, even if ye can no more than desire to believe, let this desire work in you, even until ye believe in a manner that ye can give place for a portion of my words."
Alma describes the process of obtaining faith: One experiments on the message (the evidence) by arousing one's faculties (reason)... Testing the words of God's authorized messengers through reason to determine whether they are true. Which, if that conclusion is reached (by the power of the Holy Ghost; because it is the Holy Ghost which validates the truthfulness of all things), then one will begin to have faith. So as Paul says in Romans, faith comes by hearing the word of God and testing the verbal or written evidence through reason as Alma says, and then seeking confirmation from the Holy Ghost through sincere prayer.