1 Nephi 15:6-11
6 And it came to pass that after I had received strength I spake unto my brethren, desiring to know of them the cause of their disputations.
7 And they said: Behold, we cannot understand the words which our father hath spoken concerning the natural branches of the olive-tree, and also concerning the Gentiles.
8 And I said unto them: Have ye inquired of the Lord?
9 And they said unto me: We have not; for the Lord maketh no such thing known unto us.
10 Behold, I said unto them: How is it that ye do not keep the commandments of the Lord? How is it that ye will perish, because of the hardness of your hearts?
11 Do ye not remember the things which the Lord hath said?—If ye will not harden your hearts, and ask me in faith, believing that ye shall receive, with diligence in keeping my commandments, surely these things shall be made known unto you.
Nephi’s was not a fancied sorrow. It sapped Nephi’s strength and it took a while for him to recover. Although his brothers may have taken them differently, Nephi’s words seem not to be so much a chastisement as they are an expression of his pain. Nephi’s words were also an urgent plea, which he offered even though he had seen in vision that they would not listen. His promise is extended to us by the words of Alma, “he that will not harden his heart, to him is given the greater portion of the word, until it is given unto him to know the mysteries of God until he know them in full” (Alma 12:10). That same promise was made through the Prophet Joseph: “He that keepeth his commandments receiveth truth and light, until he is glorified in truth and knoweth all things” (D&C 93:28).