i think in the old testament , and in the new testament -up to a point , God's mercy was shown over and over to His people.
then, as it looks like in Revelation, maybe Daniel and Ezekiel, when God's Judgment is executed finally, it is not mixed with mercy (at the end, the last days of earth).... because in previous times, God saved a remnant of His people most of the time , if not all the time -- people could and did repent. but in Revelation somewhere, doesn't it say that even when 1/3 of mankind is dead, the rest of the people don't repent ? not because God wasn't willing to forgive them, but because they chose all their life not to turn to Him... ... like somewhere it is written that they loved the darkness instead of the Light(Jesus)? this is just in general, not something specific - but i don't see people in the book of Revelation turning to God when the fierce troubles start and continue to the end.... does anyone see people in the Bible repenting in the end days ?