Proverbs 14:2 (NKJV) — 2 He who walks in his uprightness fears the LORD, but he who is perverse in his ways despises Him.
The proof is in the lifestyle. People may make all kinds of confessions with their mouths, but in the final analysis, their love for God or indifference toward Him is demonstrated by the way they live. At some point, faith must be translated into action. Without works, faith is dead. (See James 2:14-26.)