F.B. Meyer emphasizes the grave consequences of sin, illustrating how it can permanently hinder one's usefulness to God through the examples of Moses, Saul, and Elijah. He highlights that while God may restore some, like Peter, others may face irrevocable consequences for their disobedience. Meyer warns that even prominent leaders can fall into temptation and be replaced in God's work, urging vigilance and humility in service. He reassures that while God may discipline His servants, He never forsakes His children, encouraging those who have strayed to return to Him for healing and restoration.