युक्तः प्रमाद्यसि हितादपेतः परितप्यसे ।
यदि नेष्टात्मनः पीडा मा संजी भवता जने ॥
When you get what you long for, you will become happy. You will feel sad when you don't get it. Since you do not like to be hurt, you must not hurt others too.