How do we know God's love guarantees salvation?

The assurance of salvation stems from the belief that God loves His people and will not lose any of them. The parable of the lost sheep in Luke 15 teaches us that Christ, the Good Shepherd, searches relentlessly for each of His lost sheep. His successful search and ultimate finding of those sheep depict that His love is effectual; it does not simply desire to save but actively accomplishes that salvation. Therefore, God's sovereign love ensures that all those whom He has chosen will come to Him and will never be lost.