Why is abiding in Christ important for salvation?

Abiding in Christ is crucial for assurance of salvation and reflects the true nature of believers' relationship with Him. In 1 John 2:28, the call to 'abide in Him' is a reminder for believers to focus continually on Christ, thereby growing in faith and assurance. This abiding is the evidence of being 'born of Him'; it expresses a persistent faith that trusts in His finished work. The relationship denotes that true believers will not fall away, as they are sustained by the unction from the Holy One, enabling them to resist the temptation to rely on their works or efforts for salvation. This focus on Christ fosters an understanding that He is the source of all righteousness (Philippians 3:9).