Alma 25

To the Anti-Nephi-Lehies salvation did not come by the law of Moses, "but the law of Moses did serve to strengthen their faith in Christ; and thus they did retain a hope through faith, unto eternal salvation, relying upon the spirit of prophecy, which spake of those things to come" (16).

Faith in the Lord Jesus Christ is the first principle of the gospel (Articles of Faith 1:4).


Dallin H. Oaks said:

You need the strength that comes from faith and trust in the Lord Jesus Christ if you are to fulfill your duty “to stand as witnesses of God at all times and in all things, and in all places” (Mosiah 18:9). In times of trial you need the comfort offered in the holy scriptures, which assure you that when you have the shield of faith you will “be able to quench all the fiery darts of the wicked” (D&C 27:17). 

Faith in the Lord Jesus Christ prepares you for whatever life brings. This kind of faith prepares you to deal with life’s opportunities—to take advantage of those that are received and to persist through the disappointments of those that are lost. 

Most importantly, faith in the Lord Jesus Christ opens the door of salvation and exaltation: “For no [one] can be saved, according to the words of Christ, save they shall have faith in his name” (Moro. 7:38). ("'Faith in the Lord Jesus Christ'").

Faith in the Lord Jesus Christ is pretty important. Faith is means action. Faith is action. You don't just believe something, you act on that belief. So you don't just believe in the Savior, you act on that belief. That's what faith in the Lord Jesus Christ is.