When I am abroad, I always make it a rule never to criticize or attack the government of my own country. I make up for lost time when I come home.
When I was younger I made it a rule never to take strong drink before lunch. It is now my rule never to do so before breakfast.
Do something every day that you don't want to do; this is the golden rule for acquiring the habit of doing your duty without pain.
The superior man, extensively studying all learning, and keeping himself under the restraint of the rules of propriety, may thus likewise not overstep what is right.
As an example to others, and not that I care for moderation myself, it has always been my rule never to smoke when asleep, and never to refrain from smoking when awake.