Luke 2:14 states that when Jesus was born, an angelic choir sang “Glory to God in the highest, and on earth peace, good will toward men.
1 John 2:2 states that Jesus Christ is the propitiation for our sins; and not for ours only, but also for the sins of the whole world.

The Merriam-Webster’s dictionary defines the word “propitiation” as “to gain or regain the favor or good will; appeasing God with an atoning sacrifice.” So in other words, we can say that while the angelic choir sang about the Salvation (good will) of all mankind, they were singing about the atoning Sacrifice of the maker of all mankind. In other words, the angels were singing, “Glory to God in the highest, and on earth peace, and propitiation for ours sins and for that of the whole world (all men/women).”

The will of God is that all are called to repentance (2 Peter 3:9) and are saved (2 Peter 3:15). In other words, the will of God is the good will of all men. God’s will is good will toward all men so that man may in turn do God’s will.

Luke 2:14 (KJV)
14 Glory to God in the highest, and on earth peace, good will toward men.

1 John 2:2 (KJV)
2 And he [Jesus] is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.