How do we know that God gives faith to His people?

Throughout Scripture, we see the principle of God granting faith to individuals, as illustrated in the account of the centurion in Matthew 8. This Gentile man not only recognized Christ's authority but also believed, demonstrating the faith that was given to him by God. The centurion's faith is highlighted by Jesus' response in verse 10, where He marvels at such great faith, indicating that it is not a common faith, but a faith that God has divinely instilled in His elect. Moreover, as Paul teaches in Romans 10:17, 'So then faith cometh by hearing, and hearing by the word of God,' affirming that it is through God's word that He imparts faith to His chosen ones.