Zen answered...

Of all the definitions of faith I have read or heard, I add the simplest and most complete to me, which is the Love of Christ. I cannot think of a better way to describe faith. Love of Christ is the substance of hope in something evident we can not see with earthly eyes. It is the faith in Christ or the love of Christ that enabled Able to make a more perfect sacrifice (Hebrews 11:4). That love is why we believe in Christ, it is why we have grace, it is why we have works, it is why we have belief, it is why we have hope, it is why we have charity, it is the very essence of faith, and faith is the very essence of the Love of Christ

Perfect knowledge is worthless without faith. For instance, most of us have perfect knowledge that applying a pointed pencil to paper will cause a mark. That knowledge will not make a mark if we do not exercise the elements of faith called works (picking up the pencil, applying it to the paper, and making a mark), belief (that doing so will make a mark), and hope (that it actually will make a mark). It is my desire that you would exercise works to find out about Christ and study Him, that you would believe on His words and His life and His sacrifice, and that you would hope that He would have an effect in your life. If you exercise this faith, you will truly come unto Him.