Action is the foundational key to all success.
The Knight of Swords is all action and energy. He moves forward without consideration of danger or consequence. He can be too single-minded in his focus on attaining a goal or finishing a project. Great ambition and determination are associated with this card.
Inverted, the Knight of Swords is an impulsive whirlwind of energy and hype. They are full of ideas and action but have very little preparation or follow-through. They are likely to act without regard for consequence and as a result failure follows the many exciting projects they are involved with.