This is not a post for riddles but this one riddle...
I take the following riddle from a book I quite enjoy, titled "A Clash of Kings" from George R.R. Martin's series of A Song of Ice and Fire. The riddle deals with the concept of "power", and it may seem a tad out of place (the novel is a fantasy) but still worth a thought. It is as follows:
"In a room sit three great men, a king, a priest, and a rch man with his gold. Between them stands a sellsword, a little man of common birth and no great mind. Each of the great ones bids him slay the other two. 'Do it,' says the king, 'for I am your lawful ruler.' 'Do it,' says the priest, 'for I command you in the names of the gods.' 'Do it,' says the rich man, 'and all this gold shall be yours.' So tell me- who lives and who dies?"