How do we know that true faith in Christ is sufficient for salvation?

Scripture clearly affirms that true faith in Christ is sufficient for salvation. In Romans 10:9, it is stated, 'If thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.' This reinforces the essential belief that salvation is rooted in faith in the person of Jesus Christ. The nature of this faith is a gift from God, wrought by the Holy Spirit, which transforms the believer's heart and aligns their life with God's will.

Furthermore, John 3:16 exemplifies the promise of salvation, stating 'For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.' This underscores the assurance that anyone who sincerely believes in Christ is granted eternal life, confirming that true faith—the kind that not only acknowledges Christ intellectually but also embraces Him personally—is indeed sufficient for salvation.