When the multitudes (literally thousands) of angels announced the birth of Jesus Christ, they proclaimed "Glory to God in the highest, and on earth peace among those with whom he is pleased!" (Luke 2:14). Notice the promise of peace is made but there is a qualifier. It is reserved for those with whom God is pleased. Now before we run off and compile a good works "to-do" list to help us secure peace, remember that no one is righteous on their own merit (Romans 3:10). We become righteous only through Christ's sacrificial death on our behalf (2 Corinthians 5:21).
As believers, we trust in Jesus Christ, the Prince of Peace (Isaiah 9:6). Our Lord provides us the peace that passes all understanding (Philippians 4:7). Christ himself declared, "I have said these things to you, that in me you may have peace. In the world you will have tribulation. But take heart; I have overcome the world." (John 16:33). There is an inseparable connection between Jesus Christ and peace. Now notice how Jesus was pleasing to the Father. At the moment of his baptism, God's audible voice declared "This is my beloved Son, with whom I am well pleased." (Matthew 3:17). His obedience to God's will--in this case through baptism--made Jesus pleasing to the Father.
As the Christmas season ends and proclamations of peace on earth cease, remember that the promise of peace is ours to claim; first by trusting Jesus Christ as our Lord and Savior and next by being obedient to God's revealed will.