Acts 1:4 On one occasion, while he was eating with them, he gave them this command: “Do not leave Jerusalem, but wait for the gift my Father promised, which you have heard me speak about.
The gift God has promised us is not a gift which is all wrapped up in nice colourful paper and has a bow on it; but it is one which is worth waiting for and will last forever!
How often are you disappointed with a gift someone has given you or said they would give you? How often did you expect far more than you got?
Jesus did sort of explain it and we may well have been given a rough idea of what it is like to have Christ in our lives; but when we do experience what it is like, the gift is far more than we expect!