From World Peace, by Swami Sivananda, publ. 1957:
Only removal of ignorance can stop all future wars and dissensions. Spiritual culture, ethical education, measures that are best calculated to instill love and a sense of unity in men and women can prevent nations from resorting to war. If all people begin to practice kindness and mercy, how can they at the same time stand with weapons and guns in their hands to destroy each other? Individual peace alone can lead to the establishment of universal peace. May there be peace, plenty and prosperity throughout the whole world! May all nations be united by the bond of love!