Someone told me recently that the Holy Ghost can't teach you anything new but can only bring to your remembrance things you already know. Is that true?
4 And when ye shall receive these things, I would exhort you that ye would ask God, the Eternal Father, in the name of Christ, if these things are not true; and if ye shall ask with a sincere heart, with real intent, having faith in Christ, he will manifest the truth of it unto you, by the power of the Holy Ghost.
5 And by the power of the Holy Ghost ye may know the truth of all things.
According the verse 5 it seems like the Holy Ghost can tell you the truth of all things. But in verse 4 it says when "ye receive". Sounds like this model can be applied to receiving (or being taught) anything. Basically when we are taught, told or hear about anything that doesn't make sense or feel right we can pray and ask God and he'll tell us through the Holy Spirit or Holy Ghost if its good and true.
26 But 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.
In John it says the Holy Ghost will teach you all things and bring all things to your remembrance. It makes sense to me that bringing things to your remembrance is how the Holy Ghost teaches us all things. As we ponder later, as we go about our lives, the Holy Ghost can help us remember things so we further understand them in our current situation. So it would seem Sunday worship, General Conference, daily scripture study help us to fill up on the gospel making it easier for the Holy Spirit to help us remember. As we pray and ask and ponder the gospel we invite the Spirit to help us make connections.