The heart is the source of life. We must work to guard it and keep in good condition so that we will have a good life.
Jesus said that offences must come. However, you can choose to allow the hurt to make you bitter, or you can decide that the pain will not cripple you.
Envy is pain at the success of others. How you feel in the company of success when that success is not you, is a gauge for envy.