How do we know that God's people need comfort?

In Isaiah 40, God commands His servant to comfort His people, indicating an awareness of their need. God's people are not exempt from trials and tribulations; rather, they are described as sinners saved by grace who grapple with their infirmities. The acknowledgment of their struggles—social, spiritual, or emotional—demonstrates that even the redeemed experience hardships. God recognizes these challenges and provides His Word as the ultimate source of comfort and assurance that He is with them amidst their struggles.