Why should Christians look to Christ for assurance of salvation?

Christ is the only source of assurance for believers because our salvation isn't based on our merits or efforts, but solely on His finished work on the cross. As seen in Acts 4:12, there is 'no other name under heaven given among men whereby we must be saved.' When Christians look within themselves, they often find imperfection and sin, leading to doubt; therefore, focusing on Christ, who is able to keep us from falling, gives true assurance. We must cling to the truth that He presents us faultless before God, making our faith a matter of relying on His grace rather than our flawed selves.