Psalm 13:5 But I have trusted in thy mercy, my heart shall rejoice in thy salvation.
While surrounded by troubles and attacked by enemies, David trusts in the mercy of God and rejoices in His salvation. His response to problems is to turn to the Lord and trust in the mercy of God for help and deliverance. He expects God to hear and answer, not because he deserves it, but because He is merciful, and he believes it. This kind of trust in a merciful God results in joy and rejoicing. Because of God, life is good.
The mercy of God is revealed to us in the life, death, and resurrection of His Son, Jesus Christ. The Lord has shown us His mercy in Christ, who in love entered into our sinful world, and we can trust it. Then we rejoice in the Lord always, for He has saved us. For Christ’s sake, He forgives our sin, answers our prayer, meets our need, and delivers us from trouble. So, no matter what circumstances surround us or what dangers threaten us, we can always trust and rejoice. And no one and nothing can take that away.