Psalm 84:11-12: Two Sides to Shield and Light
Psalm 84:11-12: For the Lord God is a sun and shield;
the Lord bestows favor and honor.
No good thing does he withhold
from those who walk uprightly.
12 O Lord of hosts,
blessed is the one who trusts in you! 
These sweet verses,  resemble the glorious truth of Romans 8:28.  Both verses “picture vividly all that is outgoing and positive (light, joy, heat, energy . . .) and all that is protective; the answer to fear and defeat – but a soldier’s answer.”  When God shields believers, He is also their “reward,” “refuge,” “glory,” “strength,” “help,” “blessing” and more in life’s trying, confused, and terrifying moments.  This Psalm points to what is fulfilled in Christ,  Who will be the eternal light to His followers in a land free from evil. 
But verses 11 and 12 also teach these good things are only for those who believe in Jesus Christ as their exclusive means of salvation.  Know that if you lock shields with the Trinity, either in opposition to Him, His people, or His Word, you will be destroyed and eternally punished.  You may think there is no God, no help for Christians, and no life after death, but that is because sin has blinded you.  If you currently oppose the Light, may God in His mercy open your eyes to your need of Him, and cause you to repent of your sins. Then Christ will shower His benefits on you, as He has done to me and all who are saved from their wickedness too. 
 The Holy Bible: English Standard Version. (Wheaton, IL: Standard Bible Society, 2016), Logos Bible Software. All Scripture passages from here forward will be ESV unless noted otherwise.
 Derek Kidner. Tyndale Old Testament Commentaries, Vol. 16: Psalms 73-150 An Introduction and Commentary. General Ed. Donald J. Wiseman. (London, England: Inter-Varsity Press, 1975), 338.
 James Montgomery Boice. Psalms, Vol. 2: Psalms 42-106. (Grand Rapids, MI: Baker Books a division of Baker Book House Company, 2000), 693.
 Kidner, TOTC: Psalms, 338.
 Genesis 15:1; Psalm 2:12, 3:3, 5:12, 18:2, 27:1, 28:7, 59:11, 84:9, 115:9-11, 119:114, Proverbs 2:7, and 30:5.
 Kidner, TOTC: Psalms, 337 (footnote 74), and 338.
 Isaiah 60:19-20, Malachi 4:2, Revelation 21:23, and Revelation 22.
 Genesis 12:1-3; Numbers 9:24; Galatians 3:4, 3:14, 3:16, see also John 14:6, and G.K. Beale, A New Testament Biblical Theology: The Unfolding of the Old Testament in the New. (Grand Rapids, MI: Baker Academic, a division of Baker Publishing Group, 2011), 723.
 Psalm 68:21, 143:12; Isaiah 63:1-6; Matthew 25:41-46; Revelation 19:11-21, 20:7-21:8. See also The Westminster Standards: The Westminster Confession of Faith, the Larger Catechism, and the Shorter Catechism. (Philadelphia, PA: Great Commission Publications, 2011), Shorter Catechism question and answer 26.
 John 1:1-13; Romans 1:18-32; 8:7-8; Ephesians 2:1; 1 John 2:11, etc.
 Colossians 1:15-23, Romans 5:6-11.