'Quickly' signifies certain and full, because 'time' signifies state and so 'quickly' and 'speedily' mean a current state of affection and thought, or what is certain and full.

(Odkazy: Apocalypse Explained 216; Apocalypse Revealed 914)

216. Verse 11. Behold, I come quickly, signifies that this is certain. This is evident from the signification of "quickly," as being certainty and fullness (See above, n. 7). "Quickly" signifies certainty and fullness, because time and all things pertaining to time in the Word signify states; therefore "quickly" and "speedily" signify a present state of affection and of thought therefrom, consequently certainty and fullness. (That time and all things of time correspond to states, and therefore signify states, see in the work on Heaven and Hell 162-169; and that "quickly" signifies what is stirred up by affection, thus what is present and certain, see Arcana Coelestia 7695, 7866)