Behold, I come quickly: hold that fast which thou hast, that no man take thy crown.
Behold. Omitted by 'Aleph (') A B C, Vulgate, Coptic, Syriac.
I come quickly - the great incentive to faithfulness, and the consolation under trials.
That fast which thou hast - "the word of my patience" (Revelation 3:10), just commended to them for keeping: involving with it the attaining of the kingdom. This they would lose if they exchanged consistency and suffering for compromise and ease.
That no man take thy crown - that no tempter cause thee to loss what otherwise thou wouldst receive: not that the tempter would secure it for himself (Colossians 2:18).