All faith must be contained within the Word otherwise we stand on nothing. This is the faith by which we begin. It is the same faith by which we must stand, walk, and live.
Faith has nothing to do with worldly understanding.
True faith is anchored on scriptural facts. It must be based upon the certainty of the Word, absolute and total faith in it, and most importantly, holding that word with its power in our spirit. Faith is not believing or thinking but rather a certainty based on Biblical fact. Thus you know whether your faith is real and based on the Word of God, or probabilities, hope, and methods of man to accomplish something. Once we begin to count on these facts, then and only then does the Father begin to build us up and increase our faith.