Hatred, revenge, bitterness – these are negative emotions. The person harbouring those — Ahmed Kathrada
Whenever one finds oneself inclined to bitterness, it is a sign of emotional failure. — Bertrand Russell
Worry, hate, fear-together with their offshoots: anxiety, bitterness, impatience, avarice, unkindness, judgmentalness, — Neale Donald Walsch