The sword is said to be the emblem of military honor and should incite the bearer to a just and generous pursuit of honor and virtue. It is symbolic of liberty and strength. In the Middle Ages, the sword was often used as a symbol of the word of God. The sword (especially borne with flames) is also a symbol of purification. When borne with a cross in the same field, the sword signifies the defense of the Christian faith. The usual form is a long straight blade with a cross handle, though the blade may also be waved or embrued. There are also specific types of swords that may be described such as the falchion or seax, which is a broad bladed, slightly curved sword with a semi-circular notch at the back of the blade. Others include a scimitar, cutlass or sabre. A sword is often depicted piercing an animal or a human heart. Two swords crossed in saltire is an emblem of St. Paul.