We are taught to love and be kind to one another. To be forgiving and not harm others even if we may have suffered harm from them.
We may do this because the bible teaches that to do so we will be rewarded in heaven. However, the deeper meaning would be to adopt a forgiving and loving nature in this world whereby we will not feel hate or ill feeling at any time towards others and thus also feel peace and happiness in this life that God has also given us.