APAD: Live and let live.
So you should tolerate the opinions and behavior of others so that they will similarly tolerate your own.
Live and let live is also known as the non-aggressive co-operative behavior that developed spontaneously during the First World War, particularly during prolonged periods of trench warfare on the Western Front. Perhaps one of the most famous examples of this is the "Christmas truce" of 1914 thats soldiers from both sides (the British and the German) exchange cheerful conversation.
It is a process that can be characterised as the deliberate abstaining from the use of violence during war. Sometimes it can take the form of overt truces or pacts negotiated locally by soldiers. At other times it can be a tacit behaviour—sometimes characterised as "letting sleeping dogs lie"—whereby both sides refrain from firing or using their weapons, or deliberately discharge them in a ritualistic or routine way that signals their non-lethal intent.
picture below :(an artist's impression from The Illustrated London News of 9 January 1915: "British and German Soldiers Arm-in-Arm Exchanging Headgear: A Christmas Truce between Opposing Trenches").
This behaviour was found at the small-unit level, sections, platoons or companies, usually observed by the "other ranks", e.g., privates and non-commissioned officers. Examples were found from the lone soldier standing sentry duty, refusing to fire on exposed enemy soldiers, up to snipers, machine-guns teams and even field-artillery batteries.
Upper echelon commanders—those of divisions, corps and armies—and their staffs were aware of this tendency towards non-aggression, and would sometimes analyse casualty statistics to detect it. Raids or patrols were often ordered to foster the correct "offensive spirit" in the troops.
The Live and Let Live system was fragile at best and was easily broken by occurrences of lethal force, becoming even more tenuous as the war dragged on.