Wise leaders generally have wise counselors because it takes a wise person themselves to distinguish them.
DiogenesSolon used to say that speech was the image of actions; . . . that laws were like cobwebs, - for that if any trifling or powerless thing fell into them, they held it fast; while if it were something weightier, it broke through them and was off.
DiogenesAntisthenes used to say that envious people were devoured by their own disposition, just as iron is by rust. Envy of others comes from comparing what they have with what the envious person has, rather than the envious person realising they have more than what they could have and certainly more than some others and being grateful. It is really just an inability to get a correct perspective on their lives.
Diogenes