This Is How We Are Sure

My dear church family near and far, this is my heart's burden: Truth can't be said any better than in Scripture...

This is how we are sure we have come to know Him: by keeping His commands. The one who says, "I have come to know Him," without keeping His commands, is a liar, and the truth is not in him. But whoever keeps His word, truly in him the love of God is perfected. This is how we know we are in Him: the one who says he remains in Him should walk just as He walked.
1 John 2:3-6

...¹⁶ yet we know that no one is justified by the works of the law but by faith in Jesus Christ. And we have believed in Christ Jesus, so that we might be justified by faith in Christ and not by the works of the law, because by the works of the law no human being will be justified. ¹⁷ But if, while seeking to be justified by Christ, we ourselves are also found to be sinners, is Christ then a promoter of sin? Absolutely not! ¹⁸ If I rebuild those things that I tore down, I show myself to be a lawbreaker. ¹⁹ For through the law I have died to the law, that I might live to God. I have been crucified with Christ; ²⁰ and I no longer live, but Christ lives in me. The life I now live in the flesh, I live by faith in the Son of God, who loved me and gave Himself for me. ²¹ I do not set aside the grace of God; for if righteousness comes through the law, then Christ died for nothing.
Galatians 2:16-21