Believers must repent for being discouraged by their sins
“Their being discouraged by their sins will cost them many a prayer, many a tear, and many a groan; and that because their discouragements under sin flow from ignorance and unbelief. It springs from their ignorance of the richness, freeness, fullness, and everlastingness of God’s love; and from their ignorance of the power, glory, sufficiency, and efficacy of the death and sufferings of the Lord Jesus Christ; and from their ignorance of the worth, glory, fullness, largeness, and completeness of the righteousness of Jesus Christ; and from their ignorance of that real, close, spiritual, glorious, and inseparable union that is between Christ and their precious souls.
Ah! Did precious souls know and believe the truth of these things as they should, they would not sit down dejected and overwhelmed under the sense and operation of sin. God never gave a believer a new heart that it should always lie a-bleeding, and that it should always be rent and torn in pieces with discouragements.”
- Thomas Brooks, Precious Remedies Against Satan’s Devices
From Of First Importance