But I have trusted in Your mercy; My heart shall rejoice in Your salvation. Ps. 13:5
But I have trusted in Your mercy: The faith, hope, and confidence of the psalmist increased by prayer and he trusted not in his abilities, not in his own heart, nor in his own righteousness but in the mercy of God. We must never forget that our future is in God's hands and we just need to trust in His lovingkindness.
My heart shall rejoice in Your salvation: It is easy to have joy when all things are right but when everything goes wrong, joy is likely to disappear. But God is able to make us experience joy which is real, deep-rooted and lasts forever in the midst of all our troubles and worries if we believe in Him.
Have a Blessed Day!