make it a rule to (do something)
To insist on doing something that one considers proper, beneficial, or appropriate. I make it a rule to treat my staff to a big night out three times a year to keep them happy. You should make it a rule to back up your computer once a month at the very least!
make it a ˈrule to do something
always do something because you think it is a good idea or the right thing to do: I make it a rule to invite all my students to a party at my house once a year.