May I say to you that in reality a man cannot forget anything? He may have a lapse of memory; he may not be able to recall at the moment a thing that he knows, or words that he has spoken; he may not have the power at his will to call up these events and words; but let God Almighty touch the mainspring of the memory, and awaken recollection, and you will find then that you have not even forgotten a single idle word that you have spoken!
I believe the word of God to be true, and, therefore, I warn the youth of Zion, as well as those who are advanced in years, to beware of saying wicked things, of speaking evil, and taking in vain the name of sacred things and sacred beings. Guard your words, that you may not offend even man, much less offend God.
(Joseph F. Smith, “A Sermon on Purity,â€? Improvement Era, May 1903, pp. 503–4)