"First keep peace with yourself; then you will be able to bring peace to others. A peaceful man does more good than a learned man. Whereas a passionate man turns even good to evil and is quick to believe evil, the peaceful man, being good himself, turns all things to good." Source: Thomas a’ [...]
"By its nature the Eucharist is the sacrament of peace. At Mass this dimension of the Eucharistic mystery finds specific expression in the sign of peace." Source: Pope Benedict XVI, SACRAMENTUM CARITATIS (Sacrament of Charity), 2/22/2007
Ven. Fulton Sheen reminds us that humility is the key to inner peace. We must put Jesus first, and accept that He is greater than we are. As long as we maintain our pride, we cannot find peace. "There has been no greater secret of inner peace ever given than in the words of John [...]