The Angel of Salvation stands bearing a Palm Branch in the right hand, and in the left, hand a circlet of stars. In Christian art, stars are used to refer to the promised coming of Christ. Palm leaves often symbolize the Triumphal Entry when Jesus rode into Jerusalem on a donkey and all the crowds cheered for him and waved palm branches. In ancient Greece, palm leaves were a symbol of victory.
"After this I looked, and there before me was a great multitude that no one could count, from every nation, tribe, people, and language, standing before the throne and before the Lamb. They were wearing white robes and were holding palm branches in their hands. And they cried out in a loud voice: 'Salvation belongs to our God, who sits on the throne, and to the Lamb.' All the angels were standing around the throne and around the elders and the four living creatures. They fell down on their faces before the throne and worshiped God, saying: 'Amen! Praise and glory and wisdom and thanks and honor and power and strength be to our God forever and ever. Amen!'"
"...the saying that is written will come true: 'Death has been swallowed up in victory. Where, o death, is your victory? Where, o death, is your sting?' The sting of death is sin, and the power of sin is the law. But thanks be to God! He gives us the victory through our Lord Jesus Christ."
-1 Corinthians 15:54-56
The Speer window was a gift of Charles E. Speer in memory of Betty Morrow Speer (1802-1887) and James Ramsey Speer (1796-1891).