43 “For no good tree bears bad fruit, nor again does a bad tree bear good fruit, 44 for each tree is known by its own fruit. For figs are not gathered from thornbushes, nor are grapes picked from a bramble bush. 45 The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks. (Luke 6:43-45)
Every person can identified as to what they really stand for by observing their words and actions too. Inward thoughts of a person eventually show up in the way they behave sooner or later. A person who fakes his love for classical music can try to hide his intentions. But when someone asks him about Mozart or Beethoven being the latest new entrants to rap music, he might not know what to do. He might actually say yes he even heard a few of the rap concerts. That’s exactly when he can be told that these men were of the past centuries and actually had more to do with classical music than anything else. A person genuinely interested in classical music will not need to be told much. He will by himself research classical music, try to sing or play the notes on his musical instruments etc.
My point is; genuine actions follow the genuine intentions of the heart and false actions follow the false intentions of the heart. The Lord God is the greatest expert in knowing who is right and who is almost right and who is entirely wrong. He has established wisdom and counsel from of old and knows how to render to each one as per their works.
5 The thoughts of the righteous are just; the counsels of the wicked are deceitful.6 The words of the wicked lie in wait for blood, but the mouth of the upright delivers them. (Proverbs 12:5-6)
22 Lying lips are an abomination to the Lord, but those who act faithfully are his delight. (Proverbs 12:22)
The Holy Scriptures should be our standard by which we examine ourselves first and even others later on. Anyone willing to be humble enough to read, pray and accept the Word of God, should not find its standards too difficult to follow. We simply observe our actions and thoughts and correct them if wrong. And we continue with them if they are acceptable to the Lord. While for others and their thoughts and actions, we can be on guard from being influenced by them or correct them.