Daniel is the book that assists understandings of the Book of Revelation.
Daniel 12:4: But thou, O Daniel, shut up the words, and seal the book, even to the time of the end: many shall run to and fro, and knowledge shall be increased.
Daniel 12:6: And one said to the man clothed in linen, which was upon the waters of the river, How long shall it be to the end of these wonders?
Daniel 12: 8: And I heard, but I understood not: then said I, O my Lord, what shall be the end of these things?
Daniel 12:9: And he said, Go thy way, Daniel: for the words are closed up and sealed till the time of the end.
Danel 12:13: But go thou thy way till the end be: for thou shalt rest, and stand in thy lot at the end of the days.
Throughout ancient days, people always moved slowly by walking, riding horses or carriages. It was only till 100 years ago, when modern technology boomed with transportations now take people everywhere fast. This is the time, the end time, when knowledge has tremendously increased.