A person will experience God’s miracle and then foolishly ask for a miracle as proof that God’s miracle is true because the ego loves power and the praise of men more than God. A person can hear pure wisdom and unfutable knowledge and refuse to concede to them because pride loves imperfection and insanity more than truth.
Jesus came full of grace and truth (John 1:14, 17), performing many miraculous signs before and among many people, including the Jewish religious leaders (John 4:48, 7:31, 9:16, 11:47, 12:37). Similarly, the apostles performed miraculous signs (Acts 2:43, 5:12, 14:3). Still, many refused to believe, though a few did.
Jesus sent his apostles, including Apostle Paul, with the message of the gospel. Apostle Paul’s customer was to go into the synagogue and reason with them from the Scriptures, “explaining and proving that the Christ had to suffer and rise from the dead. ‘This Jesus I am proclaiming to you is the Christ,’ he said. Some of the Jews were persuaded…, as did a large number of God-fearing Greeks and not a few prominent women.” (Acts 17:3-4) Still, many refused to believe.
To those whom God has called, both Jews and Gentiles (Corinthian Church had both), Christ is the power of God and the wisdom of God. The foolishness of God is wiser than man’s wisdom, and the weakness of God is stronger than man’s strength. Therefore, I will always remember to preach Christ crucified, died, buried, rose from the dead, and he will come again soon… very soon.

