Wise kings generally have wise counselors; and he must be a wise man himself who is capable of distinguishing one.
DiogenesThe chief good is the suspension of the judgment [especially negative judgement], which tranquillity of mind follows like its shadow.
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