I outlined in a recent post why I believe Alma 12-13:10 to contain a temple-related sermon given by Alma-2 to a group of quasi-believers in Ammonihah. This idea is significantly bolstered by these verses in Alma 12:
9 And now Alma began to expound these things unto him, saying: It is given unto many to know the mysteries of God; nevertheless they are laid under a strict command that they shall not impart only according to the portion of his word which he doth grant unto the children of men, according to the heed and diligence which they give unto him.
10 And therefore, he that will harden his heart, the same receiveth the lesser portion of the word; and 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.
Verse 10 sounds very similar to the more famous words of Nephi in 2 Nephi 28:
29 Wo be unto him that shall say: We have received the word of God, and we need no more of the word of God, for we have enough!
30 For behold, thus saith the Lord God: I will give unto the children of men line upon line, precept upon precept, here a little and there a little; and blessed are those who hearken unto my precepts, and lend an ear unto my counsel, for they shall learn wisdom; for unto him that receiveth I will give more; and from them that shall say, We have enough, from them shall be taken away even that which they have.
