Think of your heart, this little part of your body that keeps you alive. You have absolutely no control over it. Therefore, you don't know when your death may arrive. If you come to realise the fact that we may not be alive the next second, would you still hold on to those grudges you cannot let go? Would you still hate your enemy?
Would you still look at a person and judge him by his skin colour or his religion?
If there's something common for every living being on this planet, that is death. Impermanence of life (anithya) can teach you many lessons. The most important one is, we are all the same, animals and humans. Practice compassion, spread love. Judge your superiority by looking at the person you are when no one's watching.