That good thing which was committed unto thee keep by the Holy Ghost which dwelleth in us. 2 Tim. 1:14
This means: Be diligent to focus on that which the Holy Spirit brings to our minds.
For this is what the Holy Spirit does for each of the elect of God.
John 14:24 Jesus says: 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.
John 16:13 Howbeit when HE, the Spirit of truth, is come, HE will guide you into all truth: for HE shall not speak of Himself; but whatsoever HE shall hear (from God), that shall HE speak: and HE will shew you things to come.
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