Well, it does prove something: not everything that is done by revelation in the Church is written down and included in the standard works.
Yet Log if he were to read and study the standard works he would fine a lot of what is said in the Temple is written down in scripture.
There are none so blind as those who will not see. The most deluded people are those who choose to ignore what they already know ~ John Heywood
Matthew 13
13 Therefore I speak to them in parables: because they seeing see not; and hearing they hear not, neither do they understand
Jeremiah 5:21
Hear now this, O foolish people, and without understanding; which have eyes, and see not; which have ears, and hear not:
Isaiah 6:
9- And he said, Go, and tell this people, Hear you indeed, but understand not; and see indeed, but perceive not.
10- Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed.
Yeah... sure...
...if he were to read and study the standard works he would fine a lot of what is said in the Temple is NOT written down in scripture.