Answer:
What is the beginning of eternity the end of time and space the beginning of every end and the end of every race?
I go from house to house a messenger small and tight. Whether it rains or snows I sleep outside at night.
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
If I drink I die. If I eat I am fine. What am I?
The warmer I am the fresher I am.
The answer I give is yes, but what I mean is no. What was the question?