In setting one's Mind to the Peacemakers goal of advancing Love, Peace, and Harmony on earth, it is well that Christians include in their common prayer and petition to God "THY KINGDOM COME, THY WILL BE DONE ON EARTH AS IT IS IN HEAVEN". In addition, it's been suggested an important concluding line; "AND INCREASINGLY MAKE US PERFECT LIKE YOURSELF".
Prayer is said to be effective when it is (1) Unselfish--not alone for oneself, (2) Believing--according to faith, (3) Sincere--honest of heart, (4) Intelligent--according to light, and (5) Trustful--in submission to the Creator's all-wise will.
For Peacemakers, these thoughts can also be applied in Meditation/Contemplation, Visualization and Affirmation.
Goodwill to you,