A common medieval saying between people of differing station. The saying encompasses chivalry, hope, kindness, manners, diversity, strength, respect.
For one to state that another is "well met" is to state that one has found another being or body of thought worthy of respect, of consideration, even if that other is opposite and feared. To say that one is "well met" is to celebrate a diverse point of view, even if that difference can only be settled through combat.
To state that one is "well met" is to state that one has empathy, and empathy is a commodity that, in my experience, is all too rare.