What does it mean to call upon the Lord in sincerity?

Calling upon the Lord in sincerity is an expression of genuine faith and desperation for His help. The sermon emphasizes that this cry reflects the work of God in a person's heart, demonstrating that He has first shown mercy and grace to them. Romans 10:13 states, 'Whosoever shall call upon the name of the Lord shall be saved,' highlighting that true calling comes from an awareness of one's need for salvation and the enabling work of the Holy Spirit. It is an acknowledgment of helplessness and reliance upon God's provision.