Compare Matthew 10:19-20; Mark 13:11; Luke 21:14-15; John 14:26
Jesus teaches his disciples that they’re to rely upon the inspiration of the Holy Spirit when they speak.
This does not, however, mean that they shouldn’t be trying to learn and to understand in the interim. Later, he would tell them that “the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.” (John 14:26)
To have things brought to your remembrance, though, they must at least once have passed through your mind previously.
As the Lord taught his missionaries in this dispensation, through a revelation given in September 1832, “Neither take ye thought beforehand what ye shall say; but treasure up in your minds continually the words of life, and it shall be given you in the very hour that portion that shall be meted unto every man.” (Doctrine and Covenants 84:85)
Posted from Carlsbad, California