You must manifest

You must manifest complete love and affection toward all mankind. Do not exalt yourselves above others, but consider all as your equals, recognizing them as the servants of one God.
Know that God is compassionate toward all; therefore, love all from the depths of your hearts, prefer all religionists before yourselves, be filled with love for every race, and be kind toward the people of all nationalities.
Never speak disparagingly of others, but praise without distinction.
Pollute not your tongues by speaking evil of another.
Recognize your enemies as friends, and consider those who wish you evil as the wishers of good.
You must not see evil as evil and then compromise with your opinion, for to treat in a smooth, kindly way one whom you consider evil or an enemy is hypocrisy, and this is not worthy or allowable.
You must consider your enemies as your friends, look upon your evil-wishers as your well-wishers and treat them accordingly.
Act in such a way that your heart may be free from hatred. Let not your heart be offended with anyone.

`Abdu'l-Bahá: The Promulgation of Universal Peace