Robert Murray M'Cheyne emphasizes the urgency of coming to Christ, especially for children, as life is fleeting and uncertain. He draws parallels between the brevity of life and the fragility of flowers, urging the young to seek the Savior while there is still time. M'Cheyne reflects on the joy of knowing God from a young age, as exemplified by Samuel, and encourages children to find rest in Jesus. He reassures that even in death, those who trust in Christ can find peace and joy. The sermon serves as a heartfelt call for the youth to embrace faith early in their lives.