From similars to similars, we are to proceed by the same rule.

Explanation

Reasoning by analogy is lawful and necessary: where a case falls within the reason of an established rule, the rule extends to it by operation of logic, even if the case was not specifically contemplated.

Where this applies

• No direct precedent exists but a similar case supports my position.
• I'm using reasoning by analogy because no case directly on point exists.
• We should extend the established rule to my similar situation.

See also

• 10.9.1 Of things similar, the judgment is the same.
• 10.9.2 Where the same reason exists, there the same law prevails; and of things similar, the judgment is similar.