Trying to reach out to people who lack spiritual understanding and refuse to hear? You can only speak the truth as a seed planted and release them to God. You must resist the temptation to try to force them to "get it". Flesh cannot perceive the Spirit. Speak what God gives you to say and move on without regret. Do not allow frustration to settle in your spirit. Instead know that you have obeyed God and that He is in charge.
John 14:17 ... the Spirit of truth, whom the world cannot receive, because it neither sees Him nor knows Him; but you know Him, for He dwells with you and will be in you.