Think Peace and we will have peace. We must not allow thoughts of hatred to enter our minds. War is proceeded by a thought of war. Thoughts of hatred lead to thoughts of war. A peaceful world begins with thoughts of peace, love and unity. ‘Abdu’l-Bahá puts it this way.
“I charge you all that each one of you concentrate all the thoughts of your heart on love and unity. When a thought of war comes, oppose it by a stronger thought of peace. A thought of hatred must be destroyed by a more powerful thought of love. Thoughts of war bring destruction to all harmony, well-being, restfulness and content.
Thoughts of love are constructive of brotherhood, peace, friendship, and happiness.
When soldiers of the world draw their swords to kill, soldiers of God clasp each other's hands! So may all the savagery of man disappear by the Mercy of God, working through the pure in heart and the sincere of soul. Do not think the peace of the world an ideal impossible to attain!
Nothing is impossible to the Divine Benevolence of God.
If you desire with all your heart, friendship with every race on earth, your thought, spiritual and positive, will spread; it will become the desire of others, growing stronger and stronger, until it reaches the minds of all men.”
(‘Abdu’l-Bahá, Paris Talks, p. 29, 30)