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.

I am Diogenes the Dog. I nuzzle the kind, bark at the greedy and bite scoundrels.

We have two ears and one tongue so that we would listen more and talk less.

When two friends part they should lock up each other's secrets and exchange keys. The truly noble mind has no resentments.

On being asked by someone how he could become famous, Diogenes responded: 'By worrying as little as possible about fame

No man is hurt but by himself.

Aren't you ashamed, you who walk backward along the whole path of existence, and blame me for walking backward along the path of the promenade?