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Why can a motto be changed more easily than a coat of arms in most countries?

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Image shows a seal depicting several mythical creatures fighting. — heraldry Cylinder seal impression from the Akkadian period with a combat scene between a bearded hero and a bull-man and various beasts.

In the context of heraldry, a motto can be changed more easily than a coat of arms because, unlike the arms themselves, a motto is not considered a formal, integral part of the armorial achievement.12

While coats of arms are protected by law in many monarchies and are strictly hereditary—meaning they are passed down through generations of descendants—a motto is viewed as an optional addition. Consequently, in most countries, an owner may vary or change their motto at their own pleasure.31

It is important to note that while this flexibility exists, there are exceptions; for instance, in Scotland, any change to a motto requires the formal approval of the Lord Lyon, who serves as the head of the Scottish heralds. Additionally, although mottoes are not part of the core arms, they are still included in modern grants of arms and are traditionally displayed on a scroll beneath the shield (or above the crest in Scottish heraldry).1