Faith is not certainty of knowledge, it is the substance of things hoped for, the evidence of things not seen.
Faith is trusting in God—believing that He loves us, and knows what is for our best good. Thus, instead of our own way, it leads us to choose His way. In place of our ignorance, it accepts His wisdom; in place of our weakness, His strength; in place of our sinfulness, His righteousness. Our lives, ourselves, are already His; faith acknowledges His ownership, and accepts its blessing. Truth, uprightness, purity, are pointed out as secrets of life’s success. It is faith that puts us in possession of these. Every good impulse or aspiration is the gift of God; faith receives from God the life that alone can produce true growth and efficiency.
When we speak of faith, there is a distinction that should be borne in mind. There is a kind of belief that is wholly distinct from faith. The existence and power of God, the truth of His Word, are facts that even Satan and his hosts cannot at heart deny. The Bible says that “the devils also believe, and tremble”; but this is not faith. Where there is not only a belief in God’s Word, but a submission of the will to Him; where the heart is yielded to Him, the affections fixed upon Him, there is faith—faith that works by love and purifies the soul. Through this faith the heart is renewed in the image of God. And the heart that in its unrenewed state is not subject to the law of God, neither indeed can be, now delights in its holy precepts, exclaiming with the psalmist, “O how love I thy law! it is my meditation all the day.” Psalm 119:97. And the righteousness of the law is fulfilled in us, “who walk not after the flesh, but after the Spirit.” Romans 8:1.
Faith earns nothing for us; it is the gift of God, which we may receive and cherish by making Christ our personal Saviour. FLB 90
We should be much in secret prayer. Christ is the vine, ye are the branches. And if we would grow and flourish, we must continually draw sap and nourishment from the Living Vine; for separated from the Vine we have no strength. pr 135
But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him. Hebrews 11:6 (King James Version)