# let him rejoice in all of them

"he should enjoy them all" or "he should rejoice without ceasing in all of them"

# the coming days of darkness

"how many days that he will be dead"

# for they will be many

"for he will be dead for many more days than he is alive" or "for he will be dead forever"

# Everything to come is meaningless

"No one knows what will happen after he dies" or "Everything to come is meaningless"