John Gill emphasizes the inseparable relationship between the Son and the Father in his sermon on 1 John 2:23. He argues that denying Jesus Christ as the true and eternal Son of God equates to denying the Father, as one cannot honor the Father without honoring the Son. Gill asserts that true faith and love for God are contingent upon acknowledging the Sonship of Christ, and that any attempt to diminish Christ's identity ultimately undermines the understanding of God as Father. He highlights that the acknowledgment of Christ's divine sonship is essential for a genuine relationship with God.