All the keys hang not at one man's girdle.

No individual possesses every means of access, control, or solution. The figurative “keys” suggest authority, practical means, or knowledge, and imply that important powers and resources are distributed among different people.

The saying can urge modesty and cooperation: a person may hold some authority or expertise yet must recognize others' roles and seek help beyond their reach. Its traditional masculine wording reflects the proverb's form and may be paraphrased inclusively in modern discussion.

Use it when reminding someone that responsibility, knowledge, or decision-making is shared, especially where consultation is needed. It suits discussion of limits on personal authority, not a claim that one person should control everything; its traditional masculine wording can be paraphrased inclusively.