Siemowit I, Duke of Masovia by Jan Matejko
The lance which pierces the foe before he gets near symbolizes foresight. [Raymond] Lull began his discussion of this subject by pointing out that every article of priestly vestments had its symbolic significance. Hence as knights were an order similar to the clergy, their equipment should also have a meaning. The sword is shaped like a cross. This signifies that knights should use the sword to slay foes of the cross. The sword has two edges to remind the knight that he should defend chivalry and justice.