What does the Bible say about discouragement in serving God?

In Zechariah 3, we see Joshua the high priest standing before the angel of the Lord, with Satan present to resist him. This illustrates that even the people of God face discouragement and accusations from the enemy. The Lord rebukes Satan, reminding us that it is not our worthiness that qualifies us for service, but Christ's righteousness. Discouragement often stems from feelings of inadequacy or sinfulness, but we are to remember that Christ's sacrifice covers our sins and makes us acceptable to God. When doubts arise about our ability to serve God, we are to look to the Lord's promises and the assurance of His grace.