Psa 27:2-3, 2 When the wicked came against me to eat up my flesh, My enemies and foes, They stumbled and fell.3 Though an army may encamp against me, My heart shall not fear; Though war may rise against me, In this I will be confident.
The believers reading of the the hostilities their Savior faced in this world has the understanding that they too will not be exempt. The drive to keep on living is because Christ overcame the power of darkness. In John 16:32, Jesus speaks of the reality of trials and tribulations, however, He does not leave it there, He provides the comfort needed to endure them, Joh 16:33 “These things I have spoken to you, that in Me you may have peace. In the world you will have tribulation; but be of good cheer, I have overcome the world.”
David who began this chapter with God being his light, salvation and strength has but great confidence not in self but in God, and that confidence(faith) drives out fear. Note how David sizes up God first before sizing up his challenges and facing them. Those born of God are overcomers already, 1Jn 5:4 “For whatever is born of God overcomes the world. And this is the victory that has overcome the world—our faith.”