Wise leaders generally have wise counselors because it takes a wise person themselves to distinguish them.
DiogenesAs houses well stored with provisions are likely to be full of mice, so the bodies of those that eat much are full of diseases.
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