Real faith involves the whole man, & it must include the will. The mind understands the truth, the heart loves the truth, & the will must act on the truth for it to truly be faith.
[Genesis 15 & 22]
Biblical truths demand demonstration in daily life. Real faith, dynamic faith, results in a changed life. James used Abraham and Rahab as examples of dynamic saving faith, since both of them responded in faith to the message of God.