Read Ephesians 1:12-14
And when you believed in Christ, he identified you as his own by giving you the Holy Spirit, whom he promised long ago. Ephesians 1:13b (NLT)
God’s purpose is that we will praise and glorify Him. The devil is constantly trying to get us to doubt our salvation, but there are markers of people who are living by grace through faith. As we see God using our lives to bear testimony to His name, we can know that our lives are bringing praise to Him.