1 Nephi 4

There are many who seek for a sign to substantiate their faith.  But we see over and over in the Book of Mormon, those that were given signs did not remain faithful.  So is the case with Laman and Lemuel as we read -

"...behold, an angel of the Lord came and stood before them, and he spake unto them..."  (1 Nephi 3:29)

No sooner than the angel did so that -

"...they were yet wroth, and did still continue to murmur..."  (1 Nephi 4:4)

Obviously, signs do not build faith.