Swords have two sides of the blades and represent the mind which solves complex problems but can also be a source of conflict and destruction and is to be used carefully. It is a great power that can be used for either good or ill.
In other words, Swords deal with cold rationality that often leads you to take uncompromising actions with courage. However, the most brilliant mind can get into (or even provoke) a lot of trouble when not balanced by spirit and feeling.