Antisthenes 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.

Education gives sobriety to the young, comfort to the old, riches to the poor and is an ornament to the rich.

When asked what was the proper time for supper: If you are a rich man, whenever you please; and if you are a poor man, whenever you can.

Blushing is the color of virtue.

Boasting, like gilded armour, is very different inside from outside.

Even if I am but a pretender to wisdom, that in itself is philosophy.

No man is hurt but by himself. ...Literally by how he interprets what happens to him. If he focusses on how it could have been better, he will be hurt. If he focusses on how it could have been worse, he will be happy. The same is true for women too.