When I was a kid, I was neither hot nor cold. I was a cradle-Catholic and wouldn’t renounce Christ, but I wasn’t much of a disciple of Christ either. I would have pseudo-philosophical religious conversations with friends, asking questions like, “How do we know that God is real? How do we know the Bible is really true? Couldn’t the Apostles have been hallucinating on Easter? Doesn’t science contradict religion?” And other objections of that type.
One day, when I was about 12-13 years old, I imagined myself standing before the judgement seat of God after my death. He looked disappointed and annoyed like I had promised to meet Him somewhere and never showed up. He asked, “Why didn’t you live your life like I wanted you to live it?” (At the time I thought, “Whether this idea is coming by God or just from my own imagination, I have to honestly address this question. What would I say in this situation?”) “God,” I said, “I wasn’t even sure that you were really real. How could I commit my one life to you while I was still uncertain? Who would stand out on a cliff-ledge unless they knew that it could bear their weight?” He promptly replied, “Well, did you ever really try to find out [if I was real?] I mean, did you even read my book?” When I heard this, I had two reactions. I laughed (because it was funny) and I said, “Oh crud,” (though I didn’t say “crud.”) God had called me out. If I had really been searching for the truth, I would’ve been searching differently. Instead of just asking questions I’d be looking for answers. After that, I began praying more, reading the Bible, and exploring my Catholicism more deeply. Because of this, I stand here today.
Jesus refused to give the Pharisees a sign because they weren’t really looking for the truth but excuses. If you meet someone who doubts God and says they would believe in Him if He gave them a sign, perhaps ask them if they are really searching for the truth or just raising doubts about God in order to be free from the demands of the Gospel. Whoever truly seeks, finds. As a corrolary for our own lives, for we who believe in God, don’t expect the Lord to explicitly reveal His will for you, unless you are willing to accept His will.