A Christadelphian Video: What Does “The Just Shall Live by Faith” Mean? Description: This classic Old Testament quotation, “The just shall live by faith,” is used in the New Testament. The significance and meaning of each of the key words of the title is explored. The “just” are those justified by grace; “faith” is the supreme quality of those who please God; and that faith must “live” and be demonstrated in the walk of a believer.