Read John 7.
People often become skeptical when what they “know” (actually, what they believe or assume) to be true is challenged. You and I have assumptions that seem true to us and seem to have served us well throughout our lives. Those assumptions seem “true” to us and they affect how we process anything that we hear and see.
When someone challenges those assumptions, we respond defensively with skepticism. Skepticism rises because it seems to conflict with something we think has already been proven true. The more important the principles are to you, the more skeptical and defensive you get when they are challenged.
John 7 shows us this over and over again. Jesus’ brothers are skeptical about him (vv. 1-9), the common people tended to be more open to Jesus (v. 12a, 40-41a) but many of them had suspicions about him (v. 12b, 15, vv. 25-27, 42b-44). The religious leaders were very threatened by Jesus and his teaching, so they were looking for him (v. 11) and were desperately trying to discredit him (vv. 20, and silence him (vv. 19-20, 30-32).
What was Jesus’ answer to all of this skepticism? “Anyone who chooses to do the will of God will find out whether my teaching comes from God or whether I speak on my own” (v. 17). In other words, the skepticism of the people indicated an unbelief in God. Those who were seeking God genuinely, eagerly trying to know him and serve him would instantly recognize Jesus and believe in him. But to eagerly seek after God requires his grace. He must lift the blindness of unbelief from one’s eyes in order to see the light of God’s glory in Christ.
This is why we must pray for those we want to see saved, in addition to giving them the gospel. The gospel is an immediate, direct challenge to anyone’s belief about God, about the world, about their own right and ability to choose. So, we must pray.
It also reminds us of our absolute need to submit to Christ always in all things. Many things the Word commands us to do are a direct challenge what we want, what we believe, and what we think we need. Our skepticism about believing, obeying, and living by faith in God is an expression of unbelief. So put aside your unbelief and just trust God–then you will find out that Jesus is the truth, not the other way around.