When you doubt about a thing, do not do it.

Explanation

Doubt is a counsel against action — where the lawfulness of a course is uncertain, abstention is the safer path.

Where this applies

• I'm not sure if this action is legal so I shouldn't do it.
• When in doubt about whether something is lawful, don't do it.
• Doubt about legality is a reason for caution and abstention.

See also

• 12.4.3 In doubt, the gentler or safer course is to be followed.
• 12.4.6 When there is doubt, the accused is to be acquitted.