The following is an excerpt from S. Michael Wilcox’s House of Glory: Finding Personal Meaning in the Temple, where he discusses how talking about the temple can bless others as long as we speak of it in the right time at the right place.
[When preparing to enter the temple,] we are told to pray for understanding. How often do we kneel before or after temple attendance and beseech the Lord to teach us some edifying truth from the endowment?
The Lord is willing to teach if we will ask. We must allow Him, however, to use His own wisdom about when and how to reveal a certain truth. Sometimes He will speak directly to our minds. Sometimes the answer will come in the scriptures. Insight might be presented to us by a spouse, a mother, or a father during a quiet conversation in the celestial room.
These conversations are completely appropriate and may be the means by which the Lord will answer our prayers for understanding. Occasionally we wonder what we can or cannot say about the ordinances of the temple.
Outside the temple, we must use extreme care, speaking only of those things that are in the scriptures or in the official publications of the Church. Even then, we must let this counsel be our guide: “Remember that that which cometh from above is sacred, and must be spoken with care, and by constraint of the Spirit; and in this there is no condemnation” (D&C 63:64).
Inside the temple, among those who are worthy of the ordinances, we may, again with the constraint of the Spirit, teach one another, particularly those in our own families.