I've been browsing this section for the last week and a half, and I'm finally posting some thoughts.
The first few verses talk about the Holy Ghost, and the Holy Spirit of Promise. Vs. 2-3 read, "Wherefore, I now send upon you another Comforter, even upon you my friends, that it may abide in your hearts, even the Holy Spirit of Promise; which other Comforter is the same that I promised unto my disciples, as is recorded in the testimony of John.
"This Comforter is the promise which I give unto you of eternal life, even the glory of the celestial kingdom."
Is this having your calling and election amde sure? Or is the Holy Ghost you receive after baptism accompanied by as promise of eternal life if you heed it's promptings? Is it the same thing? As far as I know, the Holy Spirit of Promise always refers to the sealing powers, but it sounds like it's more directly linked to the Holy Ghost here.