Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you. (2 Corinthians 13:3 KJV)
This is a desire we all have – proof. Not just of Christ speaking through our preacher or any man of God, but of the Christ, the sent-of-God Messiah. If we could only have proof that Jesus was the Messiah, then we would also have proof that God exists and our faith is not in vain.
Don’t expect that ‘proof’ to be given until He appears at His return.
The entire gospel hinges on faith. Our faith that God exists, that He loves mankind, that what He set in motion has reason for existence, that there were men who spoke (and speak) for Him and that His words are true. Paul rolled all of that together in his letter to the Ephesians:
But God, who is rich in mercy, for his great love wherewith he loved us, Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;) And hath raised us up together, and made us sit together in heavenly places in Christ Jesus: That in the ages to come he might shew the exceeding riches of his grace in his kindness toward us through Christ Jesus. For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast. (Ephesians 2:4-9 KJV)
If proof were given to us, it would negate this verse:
Now faith is the substance of things hoped for, the evidence of things not seen. (Hebrews 11:1 KJV)
That same proof would negate the stories that followed, stories of men who were close enough to God to step out in faith to accomplish His will. Each of those stories speak to the hearts of men today, though we are faint of heart when it comes to following His will, and some do it reluctantly. Read their stories in the Bible.
How are we doing when we ‘think’ God might exist, but we don’t go looking for Him? How do we respond when we read that ...
So then faith cometh by hearing, and hearing by the word of God.
(Romans 10:17 KJV)
... but we don’t spend time with God’s word?
Relationships are built on communication, sharing, being together. God has provide His written word that tells us we can come to Him in prayer at any time. He has also provided the Word, described by John:
In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. In him was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not. (John 1:1-5 KJV)
Please, take time to comprehend. Make requests of God for faith.