D&C 68

We are all familiar with the revelation -

"...this is the ensample unto them, that they shall speak as they are moved upon by the Holy Ghost.
4 And whatsoever they shall speak when moved upon by the Holy Ghost shall be scripture, shall be the will of the Lord, shall be the mind of the Lord, shall be the word of the Lord, shall be the voice of the Lord, and the power of God unto salvation."  (Doctrine and Covenants | Section 68:3 - 4)

A script is something that is written.  The saints are often encouraged to record or write inspired instruction given to them.  But script or scripture does not mean that such is scripture for the entire Church which only comes through the prophet.  That is why we have the "standard works".

At that time, Elder Harold B. Lee taught -

“It is not to be thought that every word spoken by the General Authorities is inspired, or that they are moved upon by the Holy Ghost in everything they read and write. Now you keep that in mind. I don’t care what his position is, if he writes something or speaks something that goes beyond anything that you can find in the standard church works [the scriptures], unless that one be the prophet, seer, and revelator—please note that one exception—you may immediately say, ‘Well, that is his own idea.’ And if he says something that contradicts what is found in the standard church works (I think that is why we call them ‘standard’—it is the standard measure of all that men teach), you may know by that same token that it is false, regardless of the position of the man who says it.” (“The Place of the Living Prophet, Seer, and Revelator” address delivered to seminary and institute of religion faculty, July 8 1964, page 14; quoted in Doctrine and Covenants Student Manual, page 144.)