That which we feed upon in our daily lives becomes the treasure of our hearts, and we will quite naturally divulge the true spirit within our humanity to those around us.
We should not think we can cleverly disguise, by way of lip service, the spirit of the world we indulge in. Upon the tasting of the waters, the spring is well known.
"Does a spring pour forth from the same opening both fresh and salt water? Can a fig tree, my brothers, bear olives, or a grapevine produce figs? Neither can a salt pond yield fresh water." (James 3:11,12)
Children of God will stumble and backslide. If a fellow believer sins, admonish them in the word of God. It is important to recognize the true spirit of those around us and treat them as such; for by their spirit we will know whether to treat them as sinners and tax collectors (Luke 5:32), or to gently restore our brothers and sisters. (Galatians 6:1) But be certain of one thing: it is not possible for holiness to flow from an unbeliever. However, we should allow the Holy Spirit to work through us so that those who are not truly born from above will be exposed to everyone else for who they really are, in hopes of bringing Godly conviction upon them.
"But if an unbeliever or someone who does not understand comes in while everybody is prophesying, he will be convinced by all that he is a sinner and will be judged by all, and the secrets of his heart will be laid bare. So he will fall down and worship God, exclaiming, 'God is really among you!'" (1 Corinthians 14:24,25)
are fervent lips with an evil heart.
Whoever hates, disguises himself with his lips
and harbors deceit in his heart;
when he speaks graciously, believe him not,
for there are seven abominations in his heart;
though his hatred be covered with deception,
his wickedness will be exposed in the assembly."