This verse, “the joy of the Lord is my strength” is found in Nehemiah 8:10. The descendants of the Israelites had returned to Jerusalem from the exile in Babylon. Ezra, the servant of God, read the law of the Lord to them. They were overcome with grief and they wept. They realised how they far they had drifted away from God. But God was merciful and loving. Through the grace of God, He reconciled us to Himself.
“The joy of the Lord is our strength”. This strength means God’s grace. In times when we are weak and frail, God’s grace will strengthen us. Nothing can separate us from God’s love (Romans 8:38). When we first and foremost put God first in our life, and love Him, we will experience radiating joy that comes only from Him.
As children of God, we have the Holy Spirit in our lives. The Holy Spirit is the Giver of Joy. Joy is a fruit of the Holy Spirit (Galatians 5:22). Even in trying and difficult times, we can experience the joy of God because of His grace and His love that never leaves us or forsake us. God’s grace and love give us strength to face the day.