Faith exists inside us but not tangible unless expressed. Others cannot know our faith if they do not see us expressing it.

God knows our heart and mind, so he knows our faith, right? Yea, but even God wants to see us expressing our faith.

"What good is it, my brothers, if a man says he has faith, but has no works? Can faith save him?" James 2.14 WEB

“One who says, ‘I know him,’ and doesn’t keep his commandments, is a liar, and the truth isn’t in him.

But whoever keeps his word, God’s love has most certainly been perfected in him. This is how we know that we are in him: he who says he remains in him ought himself also to walk just like he walked.” 1 John 2.4-6 WEB

Real life necessitates us making choices - big choices and small choices. Our choice of words and actions are tangible to others around us. Are our choices consistent with our "faith"?