Known also as the Root of the Powers of Air, the Ace of Swords represents original thought, mental clarity, and the potential of new ideas and idealogies. 
Your ability to see things clearly and call them by their true names will make friends from some and enemies from others. Not everyone is ready for the truth, so as with all cards in the Suit of Swords, it is a double-edged gift. Words can heal and words can wound, same as ideas really.
This card therefore calls for you to use the potential inherent in the Ace, in a responsible way and to trust your judgement in matters where there are two sides calling for your support. All of the Aces have the most potential for power and manifestation - the Power of Air governs the mental realm and therefore speaks to the power of words and ideas.
Right now, you have the ability to influence and persuade with your ideas and words, so make good use of this time to work towards and achieve your aims.
The Ace of Swords brings to mind the sword of Arthur, Excalibur, which symbolises the responsibility inherent in power. On one side of the sword were engraved the words "Take me!" and on the other side "Cast me away!" So there is a time to take power and a time to walk away from it, because power is not constant but is a fluctuating energy and it can as easily turn against us as it can empower us.
What does this mean for you when this card is turned? It means that you have the ability to triumph over your difficulties now, but to take care that you do not cleave to this power as it is not yours to keep, but to use in a positive way.
It is time to realise old patterns in your life and allow the winds of change sweep away the cobwebs of old thoughts and beliefs that are no longer relevant to you.
'That is the Ladye of the Lake,'seyde Merlion.'There ys a grete roche, and therein ys as fayre a paleyce as ony on erthe, and rychely besayne. And thys damesel woll come to you anone, and than speke ye fayre to hir, that she may gyff you that swerde.' - Sir Thomas Malory, Morte d'Arthur
Image "Ace of Swords" © Luis Royo