you should know a man seven years before you stir his fire

you should know a man seven years before you stir his fire

In interactions with people you don't know well, you should behave with caution and avoid meddling in their affairs. Mother, you don't know Sir Harold well enough to inquire about his personal life. Remember: you should know a man seven years before you stir his fire.
See also: before, fire, know, man, seven, should, stir, year