Its a big error for a Christian to have a single doubt about his conviction as a believer. We are not supposed to hope that there is a God, we are not supposed to hope that heaven is real nor baseless believe that Christ came and died and actually resurrected, but rather have a deep seated and concrete knowing of the reality of this truths based on spiritual evidence given to you as a Christian.
There is something responsible for the confidence we see displayed by out patriarchs in scripture. Think about it what made men at the face of eminent death refused to change their minds, many think that those martyred had no hope or help, but am of the believe that they actually refused Gods saving but chose to suffer even to death. For Bible clearly stated in Hebrews 11:35 Speaking about those who worked their faith stated “And others were tortured, not accepting deliverance; that they might obtain a better resurrection”. Meaning they were actually offered deliverance but refused to accept it but chose to die.
There is a frame of mind called the mind of Christ. Christ knew with every assurance that God was his father in that he had personal evidence backing his claim, I say “personal evidence” cause such evidence is more important to you not for you to give proof to others. And we know its this same mind that we ought to have, meaning the Mind of Christ.
So what is it that fuels the confidence of a believer? What makes you really know your stand?
I believe it is the presence of a spiritual reality, the proof of the Divine, for everyone in the Old testament that was testified to be in the faith, there had been consistent manifestations of the Spiritual in their lives that crystallized confidence in their walk with God, from Abraham that spoke with God as a man spoke with a Man, Jacobs encounter with God when he wrestled with God, to Moses with the event of the burning bush, and many more such examples scattered in scripture. Moving to the new testament the next time we saw such display of confidence and audacity was after the descending of the Holy Spirit on the disciples on Pentecost. Peter was suddenly made bold not long after denying Christ in front of young girl, preached a crowd of over 3000 to believing Christ. Why? Because he. Peter now had spiritual evidence of the reality of what he merely heard from Jesus. It was no longer a story but a reality.
Acts 1:8 says but you will receive power when the Holy Spirit has come upon you; and you shall be My witnesses both in Jerusalem, and in all Judea and Samaria, and even to the remotest part of the earth. Pointing to the fact the Holy Spirit and the evidence of Spiritual power he bestows in the believer works on building the confidence of the believer.
Now this has been consistent in the Word. That for any man who in faith seek God would find him. So the Bible says in Hebrews “But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him”, meaning for God at a certain point in your Journey of Faith would reveal himself to you, that’s the reward of seeking God in Faith. And finding God here doesn’t imply some abstract assertion but a real encounter with God, like Moses and the burning bush.
The starting point for every Christian is his encounter with the Holy Spirit. Romans 8:15-16 “For you have not received a spirit of slavery leading to fear again, but you have received a spirit of adoption as sons by which we cry out, “Abba! Father!” The Spirit Himself testifies with our spirit that we are children of God”. Our first witness is the Holy Spirit but it doesn’t stop at a heart witness, its just the beginning to opening up the believer to more intense and detailed encounters that will fuel an unshakable conviction and confidence in God. I would have loved to go deeper and speak about those who were even caught up into Heaven and many such encounters that Paul and John the beloved had but I pray God gives me grace to speak on it some other time.