"Then those who feared the Lord spoke with one another. The Lord paid attention and heard them, and a book of remembrance was written before him of those who feared the Lord and esteemed his name. 'They shall be mine,' says the Lord of hosts, 'in the day when I make up my treasured possession, and I will spare them as a man spares his son who serves him. Then once more you shall see the distinction between the righteous and the wicked, between one who serves God and one who does not serve him.'"
Being involved with books as I am, I find this most interesting. Someone took it upon himself to collect the names of the faithful into a book. God noticed, and promised to consult it when all hell broke loose, as it was bound to. Was it an angel who wrote the book? Malachi? An unnamed scribe? I suppose it doesn't matter.
The point is, it's easy to get discouraged trying to do the right thing day after day when no one notices or cares. This passage is our assurance that someone--the most important Someone there is--does most emphatically notice:
"'The day is coming, burning like an oven, when all the arrogant and all evildoers will be stubble. The day that is coming shall set them ablaze,' says the Lord of hosts, 'so that it will leave them neither root nor branch. But for you who fear my name, the sun of righteousness shall rise with healing in its wings. You shall go out leaping like calves from the stall. And you shall tread down the wicked, for they will be ashes under the soles of your feet, on the day when I act,' says the Lord of hosts."