The letter Resh stands for compassion (Rachamim). Through the exercise of compassion to others, peace and wholeness are attained both inwardly and outwardly.
"He who is merciful to others, mercy is shown to him by Heaven. -Shabbat 151b"
"Thus speaks the Lord of Hosts, saying, Render true judgment, and show loving kindness and compassion every man to his brother. -Zecharia 7:9"
"Light rises in the darkness for the upright; he is gracious, and full of compassion, and righteous. -Psalm 112:4"