In Revelation 19:12, this symbolically means that what the Word is like in its spiritual and celestial senses, no one sees but the Lord, and the person to whom He reveals it. (Apocalypse Revealed 824)

4873. '[And he said'] What is the pledge that I am to give you?' means that which made it certain. This is clear from the meaning of 'the pledge' as that which served to make it a certainty, dealt with immediately above in 4872. This meaning - that which made it certain - is also evident from what follows next regarding the pledge that was given.