Often attributed to U.S. President Theodore Roosevelt (1858-1919) as an expression of his view of foreign policy, but possibly of earlier origin.
Do not boast or utter verbal threats, but do make others aware that you are prepared to use physical force if necessary.
There is a homely old adage which runs: "Speak softly and carry a big stick; you will go far."
Under any governmental auspices, as the modern world knows governments, the keeping of the peace comes at its best under the precept, "Speak softly and carry a big stick."