Answer:
The sharp slim blade, that cuts the wind.
A beggar's brother went out to sea and drowned. But the man who drowned had no brother. Who was the beggar to the man who drowned?
Both punishment and sweet reward, It will befall both fool and lord. It is a spiritual scoreboard, Your every deed it does record.
Everyone has it and no one can lose it, what is it?
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
What did the piece of wood say when he saw the screwdriver and screws approaching?